ATAR Notes: Forum
Archived Discussion => VCE Exam Discussion 2020 => Exam Discussion => Victoria => Science Exams => Topic started by: homeworkisapotato on November 07, 2020, 07:02:12 am
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Hey everyone! How's everyone feeling about the Bio exam in 6 days?
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I was really stressed out 20 days ago, I haven't managed to do what I planned to do this past couple of days but for some reason, I am not stressed for this exam. Maybe because I have a cushion to fall back on since I'm in year 11 and I can save myself next year if all doesn't go to plan.
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How did everyone find the 5 mark question?! :o
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I finished kinda early... Hope I didn't completely miss any of the questions...or my 40 goes down the drain haha
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Did anyone else think that the Bio exam was suspiciously easy? I'm a bit worried that I found it so easy... it was easier than my past practice exams.
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Did anyone else think that the Bio exam was suspiciously easy? I'm a bit worried that I found it so easy... it was easier than my past practice exams.
I found it as easy as past exams....almost makes me think I missed a difficult question or something haha
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How did everyone find the 5 mark question?! :o
i wrote ltiereally everything i could think of but i dont know if i got all the marks lol so unexpected. i wrote stuff like where the restriciton sequence was, how many restriction sites, how many strands produced) and the sizes of them
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What did everyone think about the multi choice qs asking about B and T cell memory?
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Did anyone else think that the Bio exam was suspiciously easy? I'm a bit worried that I found it so easy... it was easier than my past practice exams.
I did find it very easy and the fact that everyone else did worried me as well! However you have to write very specific things which I think 50% of people would miss. It’s not about the write answer it’s about what VCAA wants- that’s the sad thing about VCE you can be basically right but it needs to be RIGHT.
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Do you think I will lose a mark for accidentally writing ethium bromide rather than ethiduim bromide? :( :(
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Do you think I will lose a mark for accidentally writing ethium bromide rather than ethiduim bromide? :( :(
Hmm, can never be certain but I think it could go either way for you. There isn't really anything that is actually called "ethium bromide" (that I could find) so your answer should be identifiable to your assessor as ethidium bromide.
Problems do occur is when you mispel something and it gives your answer a different meaning e.g. miosis vs meiosis
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Do you think I will lose a mark for accidentally writing ethium bromide rather than ethiduim bromide? :( :(
Teacher said that as long as they can understand it you'll get the necessary marks.
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How did everyone find the 5 mark question?! :o
Hey there.
At first I wasn’t so sure about what this question was referring to. I basically broke down the sizes of different fragments that were produced by the use of different restriction enzymes. Then I wrote an ending statement saying that BamHI had only one recognition site on the DNA whilst HindIII had two… I think that’s along the lines of what was expected. The stem of the question stated that the student wanted to see the effect of different restriction enzymes on DNA, so that is essentially what I talked about.
I’m not entirely sure what kinds of things we were supposed to talk about… if anyone knows, please correct me if I’m wrong.
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How did everyone find the 5 mark question?! :o
I wrote a bit about the different lengths and number of recognition sites, and drew a diagram showing them relative to each other and how many base pairs each fragment was. But I also talked about accuracy, precision and limitations. My teacher told me after that the question was probably just looking for a really detailed explanation of the restriction enzymes and none of the experimental design stuff.
Where did everyone put the H. denisovans on the phylogenic tree?
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I wrote a bit about the different lengths and number of recognition sites, and drew a diagram showing them relative to each other and how many base pairs each fragment was. But I also talked about accuracy, precision and limitations. My teacher told me after that the question was probably just looking for a really detailed explanation of the restriction enzymes and none of the experimental design stuff.
Where did everyone put the H. denisovans on the phylogenic tree?
I think I might have screwed up big time because I put denisovans branching off heidelbergensis haha
Now that I think about it I feel like my answers weren't specific enough yikes
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I think I might have screwed up big time because I put denisovans branching off heidelbergensis haha
Now that I think about it I feel like my answers weren't specific enough yikes
Yeah... I also messed that up I think. I put them diverging at the same point that H. sapiens and H. neanderthalensis diverged, rather than on the neanderthal line. But hopefully, I get a mark for my justification.
I also feel like there were some answers that I could have made more specific, especially the question about two reasons populations may not have the gene for lactose digestion. I'm just glad it's over and most of the exam was fairly straight-forward.
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For the question that asked why scientists aren't sure of where Homo Sapiens should be placed on the phylogenetic tree, what did you guys say?
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For the question that asked why scientists aren't sure of where Homo Sapiens should be placed on the phylogenetic tree, what did you guys say?
I talked about the incomplete fossil record and how scientists have different interpretations of the same evidence.
My friend compared the Out-of-Africa and replacement models for Homo sapien evolution though, so I'm not sure if that was the right way to go about it...
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I talked about the incomplete fossil record and how scientists have different interpretations of the same evidence.
My friend compared the Out-of-Africa and replacement models for Homo sapien evolution though, so I'm not sure if that was the right way to go about it...
Yeah, I compared the out of africa hypothesis with the multi regional hypothesis so I wasn't sure if that was correct or not.
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hey guys was the first question the page where it asked u to fill in the table with mRNA function and stuff? (of short answer) just double checking
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I talked about the incomplete fossil record and how scientists have different interpretations of the same evidence.
My friend compared the Out-of-Africa and replacement models for Homo sapien evolution though, so I'm not sure if that was the right way to go about it...
yeah that is what exactly what i wrote too. for the first question of multichoice did u write channel protein? i am scared i referred to the wrong protein
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What did you guys put for the multiple choice question on enzymes? It was on the first page. Something about Substrate A and B?? Was substrate B an irreversible competitor?
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What did you guys put for the multiple choice question on enzymes? It was on the first page. Something about Substrate A and B?? Was substrate B an irreversible competitor?
yes i put irreversible competitor as well
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yes i put irreversible competitor as well
Was that answer C?
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Was that answer C?
ye i think so
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Yeah sweet. For the multiple choice question, I think 5, where they put sodium hydrogen carbonate with some elodea, was the bubbles meant to be oxygen? And in short answer, did we have to mention secretory granules when explaining exocytosis?
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Yeah sweet. For the multiple choice question, I think 5, where they put sodium hydrogen carbonate with some elodea, was the bubbles meant to be oxygen? And in short answer, did we have to mention secretory granules when explaining exocytosis?
yep it was oxygen. ye i just said it fuses with plasma membrane and releases the histamine.
what was on the first page again, was it the table question with mRNA, i am so scared i skipped a page
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yep it was oxygen. ye i just said it fuses with plasma membrane and releases the histamine.
what was on the first page again, was it the table question with mRNA, i am so scared i skipped a page
The very first page had the image of a cell with the golgi, nucleus etc and you had to use it to describe how exocytosis occurs. It has 'secretory granule' labelled on it but I've never seen that and didn;t use it in my explanation
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The very first page had the image of a cell with the golgi, nucleus etc and you had to use it to describe how exocytosis occurs. It has 'secretory granule' labelled on it but I've never seen that and didn;t use it in my explanation
right right i remember. thanks soo much. i know for a fact that i skipped the question that asks u to label the RNA or something. so i lost a mark there, i was so scared i skipped an entire page.
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yep it was oxygen. ye i just said it fuses with plasma membrane and releases the histamine.
what was on the first page again, was it the table question with mRNA, i am so scared i skipped a page
was it histamine or adrenaline 😃
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What did you guys put for the multiple choice question on enzymes? It was on the first page. Something about Substrate A and B?? Was substrate B an irreversible competitor?
I said that substrate B was a competitive but reversible inhibitor as the end products in the tube with enzyme and Substate B were enzyme and Substrate B. If it was an irreversible inhibitor the end products would have included enzyme-receptor complexes.
Yeah sweet. For the multiple choice question, I think 5, where they put sodium hydrogen carbonate with some elodea, was the bubbles meant to be oxygen? And in short answer, did we have to mention secretory granules when explaining exocytosis?
I put oxygen as well, because the strong light source was increasing the rate of photosynthesis in the plant (and I assumed it was above the compensation point).
I did mention that the vesicles fused to become larger secretory granules before being released through exocytosis, but only because it was in the stem of the question!
was it histamine or adrenaline 😃
Adrenaline. ;D
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was it histamine or adrenaline 😃
ye adrenaline my bad confused with another question
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Did anyone manage to come up with two good answers for why there may be no alleles in a population that code for enzymes that break down lactose? I said that in regions where dairy farming was not done, there was no selective advantage to the allele, but I couldn't think of a good second reason...
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hey guys for the question involving signal transduction where it asked for what process z could be after the production of a protein, what did you say? I’ve heard so many different responses.
I wrote about enzymes breaking down viral particles due to an interferon signal transduction pathway. However i’m thinking that was probably wrong lmao
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Wait what was the question on adrenaline or histamine?
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Did anyone manage to come up with two good answers for why there may be no alleles in a population that code for enzymes that break down lactose? I said that in regions where dairy farming was not done, there was no selective advantage to the allele, but I couldn't think of a good second reason...
omg i was so confused about this question, i said something about lack of gene flow in isolated population meaning that there was no interbreeding with european individuals who had the mutation. But i had no idea lol
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omg i was so confused about this question, i said something about lack of gene flow in isolated population meaning that there was no interbreeding with european individuals who had the mutation. But i had no idea lol
Me too! I gave that as my second answer but I saw someone else mention the founder's effect so I'm still not sure. No point stressing now I guess... and only a month and a half until results.
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hey guys for the question involving signal transduction where it asked for what process z could be after the production of a protein, what did you say? I’ve heard so many different responses.
I wrote about enzymes breaking down viral particles due to an interferon signal transduction pathway. However i’m thinking that was probably wrong lmao
Now I feel stupid... I wrote exocytosis... The question wasn’t specific enough though, so who knows.
For the question where you list the 3 stages after that - was it talking about stages of signal transduction or protein synthesis??
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Now I feel stupid... I wrote exocytosis... The question wasn’t specific enough though, so who knows.
For the question where you list the 3 stages after that - was it talking about stages of signal transduction or protein synthesis??
Signal transduction!
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hey guys for the question involving signal transduction where it asked for what process z could be after the production of a protein, what did you say? I’ve heard so many different responses.
I wrote about enzymes breaking down viral particles due to an interferon signal transduction pathway. However i’m thinking that was probably wrong lmao
My bio teacher told me you could have a variety of answers because it asked to give an example and not a SPECIFIC example. Answers such as caspases cleaving proteins during apoptosis or proteins such as lactase breaking down lactose into glucose and galactose are just a few of the many possible answers!
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Where did everyone draw the denisovan line? I branched it off midway down the neanderthal line, and my explanation is that they both are similar in structure however denisovans have enough differences to be considered a seperate species?
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Me too! I gave that as my second answer but I saw someone else mention the founder's effect so I'm still not sure. No point stressing now I guess... and only a month and a half until results.
i said lack of gene flow from european population to the other populations, and other one i said not enough time has allowed for mutation to happen, i could be wrong though
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Did anyone manage to come up with two good answers for why there may be no alleles in a population that code for enzymes that break down lactose? I said that in regions where dairy farming was not done, there was no selective advantage to the allele, but I couldn't think of a good second reason...
yeah I talked about how there was no selection pressures and that individuals with the mutated allele decided to not reproduce, not sure if its entirely right haha
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I said that European population did not have gene flow with the other populations so the mutated gene was not passed to offspring in those populations
I also said that the 'some' populations may not consume milk so the gene was not favoured or the mutated gene may be a selective disadvantage preventing those with the mutated gene from reproducing viable offspring before death
What did you all put for the function of tRNA and mRNA?
I did:
tRNA: during translation, binds anticodon to complementary codon and brings corresponding amino acid which joins the polypeptide chain
mRNA: carries genetic information coding for protein from the nucleus to the ribosome for translation
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Anyone got a suggested answers for the multi choice? or whole exam would be even better.
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Anyone got a suggested answers for the multi choice? or whole exam would be even better.
YES PLSSSSS
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what did you guys put for the question after the explanation of mRNA and tRNA - something about 2 important things in RNA processing....
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what did you guys put for the question after the explanation of mRNA and tRNA - something about 2 important things in RNA processing....
I talked about alternative splicing, which removes introns (non-coding sequences) and joins exons together and enables an energy efficient process of gene expression in a cell. I also discussed how exon shuffling/juggling is used to rearrange exons (coding-sequences) and increase the functional diversity of proteins that can be produced from only one gene. I am not entirely sure how valid these two points are though.
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what did you guys put for the question after the explanation of mRNA and tRNA - something about 2 important things in RNA processing....
I talked about exons being spliced out as well as the addition of a chemical cap and a poly A tail.
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Anyone got a suggested answers for the multi choice? or whole exam would be even better.
This would be amazing please!!!
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Anyone know the answer for the cellular respiration multiple choice question? It was a diagram where I believe pathway 1 was anaerobic and pathway 2 was Krebs Cycle. One of the answers was ‘pathway 1 produces ATP’ and the other was ‘pathway 2 produces NADH to carry electrons for use in the electron transport chain’ - what did ya’ll put? Aren't these both true or am I stupid?
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Anyone know the answer for the cellular respiration multiple choice question? It was a diagram where I believe pathway 1 was anaerobic and pathway 2 was Krebs Cycle. One of the answers was ‘pathway 1 produces ATP’ and the other was ‘pathway 2 produces NADH to carry electrons for use in the electron transport chain’ - what did ya’ll put? Aren't these both true or am I stupid?
GIRL i was so confused but i put the ATP one? idk doe it was a phat guess </3
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pathway 1 was the link reaction to convert pyruvate into lactic acid and convert NADH back into NAD+. therefore ATP wasn't produced as glycolysis had already occured. I think
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pathway 1 was the link reaction to convert pyruvate into lactic acid and convert NADH back into NAD+. therefore ATP wasn't produced as glycolysis had already occured. I think
Isn’t the conversion of pyruvate into lactic acid anaerobic respiration though?? And I’m 99 precent sure ATP is produced in anaerobic respiration ?
GIRL i was so confused but i put the ATP one? idk doe it was a phat guess </3
Literally same, I said eenie meenie miney moe and guessed - the multiple choice was so hard ;(( Imma just sit and pray that my bullshitting skills payed off in part B ;(
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what did you guys write for that question related to the measles article, i think it was 'out of the children aged 5 and under, who is the least likely to die, explain why' or something like that?
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what did you guys write for that question related to the measles article, i think it was 'out of the children aged 5 and under, who is the least likely to die, explain why' or something like that?
I think you had to refer to the article and it said like 6-month-old babies had a greater survival rate and the explanation is due to natural passive immunity given from the mother via breastfeeding or travel of antibodies through the placenta before birth. That is what I wrote anyways, not 100% certain if that is correct.
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I think you had to refer to the article and it said like 6-month-old babies had a greater survival rate and the explanation is due to natural passive immunity given from the mother via breastfeeding or travel of antibodies through the placenta before birth. That is what I wrote anyways, not 100% certain if that is correct.
okay yeah that's what I wrote too but I wasn't sure if that was correct, thanks! :)
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hey guys was there a question where you had to label the rna or dna or something like that?
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hey guys was there a question where you had to label the rna or dna or something like that?
There was a question asking to label a RNA nucleotide.
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There was a question asking to label a RNA nucleotide.
was that on the page where you had to fill a table?
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was that on the page where you had to fill a table?
Hmm.. I can't remember but it was the very first question on a LEFT page.
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Hmm.. I can't remember but it was the very first question on a LEFT page.
oh it might be then because the question about RNA proccessing was on the right page and the table was on the left. i was afraid i skipped an entire page because i skipped that question
thanks man
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For the MC question with the graph of the freq. of alleles, was the answer that the allele came from gene flow or something? (i thinkkkk it was option C?)
And then with MC question with cytokines was the answer A with the inflammation?
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For the MC question with the graph of the freq. of alleles, was the answer that the allele came from gene flow or something? (i thinkkkk it was option C?)
And then with MC question with cytokines was the answer A with the inflammation?
Yep
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For the MC question with the graph of the freq. of alleles, was the answer that the allele came from gene flow or something? (i thinkkkk it was option C?)
And then with MC question with cytokines was the answer A with the inflammation?
yeah I think I put C for the allele frequency q? i think it was like 'the appearance of this allele in the 3rd generation could be due to gene flow' or smth i can't remember HAHA
ahhh I can't remember the cytokine question, sorry :/
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Isn’t the conversion of pyruvate into lactic acid anaerobic respiration though?? And I’m 99 precent sure ATP is produced in anaerobic respiration ?
Yeah, the answer was D, the one about NADH being made and used. The ATP yield from anaerobic respiration comes from glycolysis which was further up the pathway.
yeah I think I put C for the allele frequency q? i think it was like 'the appearance of this allele in the 3rd generation could be due to gene flow' or smth i can't remember HAHA
I said the same thing.
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ahhh I can't remember the cytokine question, sorry :/
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It was the one after the human cell apoptosis question in MC? (aha sorry idk how to quote like y'all do, i'm new :) )
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what did u guys write for whether it was pandemic or not
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what did u guys write for whether it was pandemic or not
1 mark for stating it was an epidemic. 2nd mark for explaining why it is an epidemic and comparing it to why it wasn't a pandemic.
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1 mark for stating it was an epidemic. 2nd mark for explaining why it is an epidemic and comparing it to why it wasn't a pandemic.
i think it is actually a pandemic but i might be wrong
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i think it is actually a pandemic
Oh really? I hope we aren't talking about the same question :/
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Oh really? I hope we aren't talking about the same question :/
the reason why i think is because the person flying to papau new guinea or fiji (forgot the place) must have came from another population who does already have the measle virus. plus australia already have vaccinated the kids a year before it got introduced there. thats what i tihnk anyway
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the reason why i think is because the person flying to papau new guinea or fiji (forgot the place) must have came from another population who does already have the measle virus. plus australia already have vaccinated the kids a year before it got introduced there. thats what i tihnk anyway
I'm actually pretty sure it was an epidemic (sorry if i'm wrong) but from what i could gather from the article was that the outbreak was isolated to that area. The article was then going on to describe vaccination programs and made a comparison to the Australian vaccination programs as a separate point?? At least that's what i remember from the article but i could have defs read it wrong
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i think it is actually a pandemic but i might be wrong
it was an epidemic. I say this because the article title was specifically about Samoa. If it mentioned all of Asia-Pacific then quite rightly it would be a pandemic however it focussed specifically on Samoa, drawing on comparisons to Australia and herd immunity etc.
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I'm actually pretty sure it was an epidemic (sorry if i'm wrong) but from what i could gather from the article was that the outbreak was isolated to that area. The article was then going on to describe vaccination programs and made a comparison to the Australian vaccination programs as a separate point?? At least that's what i remember from the article but i could have defs read it wrong
yeah that’s what i was thinking also - becyase yes measles does exist worldwide (but i don’t think it’s considered a pandemic) but the particular outbreak referred to in the article was contained to samoa or whatever country it was, therefore it was an outbreak of measles in a localised area. idk totally could be wrong but that was my train of thought
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yeah i agree but a pandemic = many populations. the person introduced the virus from another population (who went on aeroplane) to the isolated population. but i still might be wrong though
I think with a pandemic, it is "an outbreak of an infectious disease that infects more the usual amount of people, crossing multiple country borders (usually around the world". However with this question it was described a specific population (and sometimes even if it is across countries, it may not be a pandemic for example if it's close surrounding countries (got that from a past VCAA exam)) (so damn sorry if im wrong)
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but if u read the article it said australia already had measles vaccine 1 year before it was introduced to papau new guinea thats why i thought it was pandemic. sorry i know i might be wrong
What? The article referenced both the countries vaccination percentage in 2018 which would cause the high infection rate in 2019 when the event occurred. Also there are articles about it being an epidemic.
"Measles epidemic in Samoa and other Pacific islands"
https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30053-0/fulltext
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but if u read the article it said australia already had measles vaccine 1 year before it was introduced to papau new guinea thats why i thought it was pandemic. sorry i know i might be wrong
Hey there.
I get where your logic was behind your answer for this question. But I think its important to remember that, like you mentioned, Australia had actually implemented large scale vaccination programs a year before the Samoan outbreak. This would mean that Australia had developed herd immunity, so even if one person was to get infected with Measles, they wouldn’t be able to spread it amongst those around them for an outbreak/ epidemic to occur. So I think the infected person that travelled to Samoa would have caused an epidemic.
I do understand where you are coming from though.
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a pandemic is a epidemic that has spread globally. the person on the flight came from a population already with the disease which was spread to somoa. therefore, i think it is a pandemic
look at the article above. seems legit but idk
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Hey guys,
im still really confused about the NAD and the ATP question from the multiple-choice? Why was one of them wrong
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Hey guys,
im still really confused about the NAD and the ATP question from the multiple-choice? Why was one of them wrong
which question was it?
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a pandemic is a epidemic that has spread globally. the person on the flight came from a population already with the disease which was spread to somoa. therefore, i think it is a pandemic
yeaaa i get where you're coming from...i guess it depends on whether vcaa wanted us to dig that deep into the article or just recognise the fact that it was an outbreak in smaller population (in samoa) so it's an epidemic cos it didn't spread to other continents (which would be considered a pandemic), i think you should get the mark for your justification though!
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which question was it?
It was a multiple-choice showing the respiration biochemical pathway. Options C and D were like "2 molecules of ATP are created to be used for cellular processes" and D was "NAD is loaded with electrons to carry to the electron transport chain" it was something like that i cant remmeber what the actual question was, but they both seemed correct??
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It was a multiple-choice showing the respiration biochemical pathway. Options C and D were like "2 molecules of ATP are created to be used for cellular processes" and D was "NAD is loaded with electrons to carry to the electron transport chain" it was something like that i cant remmeber what the actual question was, but they both seemed correct??
The correct one is NADH carrying electrons to the electron transport chain. The other one is incorrect because in the diagram, glycolysis had already occurred (because of the production of pyruvate). Thus, this suggests that ATP had already been produced. This was just my interpretation!
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It was a multiple-choice showing the respiration biochemical pathway. Options C and D were like "2 molecules of ATP are created to be used for cellular processes" and D was "NAD is loaded with electrons to carry to the electron transport chain" it was something like that i cant remmeber what the actual question was, but they both seemed correct??
Ohhhhh yepyep
so for pathway one, it was showing anerobic respiration pathway AFTER glycosis (and this where the 2ATP are made, not in the actual part labelled pathway 1 which is where either lactic acid or alcohol & CO2 would be made)
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Ohhhhh yepyep
so for pathway one, it was showing anerobic respiration pathway AFTER glycosis (and this where the 2ATP are made, not in the actual part labelled pathway 1 which is where either lactic acid or alcohol & CO2 would be made)
yep exactly!!! (from what i think)
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ahhh i wonder what they wanted us to say for the 5 mark gel electrophoresis question...i've never come across a question like that before so i was stumped :/
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What mark do you guys think is needed out of 120 for an A+ this year?
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ahhh i wonder what they wanted us to say for the 5 mark gel electrophoresis question...i've never come across a question like that before so i was stumped :/
yessss omggg, i was like bro you've never asked of this before smh
I basically just said that like
test tube 1 with BamHI: how many restrictions sites according to the number of bands and the size of these fragments
Test tube 2: Along the same lines
Test tube 3: corresponds with the other results b/c .... BUT I HAVE NO IDEA WHAT THEY WANTED FOR 5 MARKS GEEZ?!
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yessss omggg, i was like bro you've never asked of this before smh
I basically just said that like
test tube 1 with BamHI: how many restrictions sites according to the number of bands and the size of these fragments
Test tube 2: Along the same lines
Test tube 3: corresponds with the other results b/c .... BUT I HAVE NO IDEA WHAT THEY WANTED FOR 5 MARKS GEEZ?!
SAMEEEEE i said the same stuff like number of restriction sites and size of the fragments but yeah wth were the 5 marks for lmaoooo
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What mark do you guys think is needed out of 120 for an A+ this year?
I read someone said around 85% so that would be around about 103/120 but i have no idea how that works tbh :(
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What mark do you guys think is needed out of 120 for an A+ this year?
ahhhhh idk it might be a bit easier to get an A+ cos of covid?? cos the exam wasn't any easier from previous years i think so maybe like 80%? im not sure but generally an A+ is 85% or above i think but i could be wrong :/
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What mark do you guys think is needed out of 120 for an A+ this year?
Looking at the past couple of years the percentage for an A+ hasnt really changed by that much so youd probably be looking at 80-84% id say. But who knows.
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Yeah I'm hoping I scrape an A+, felt like I underperformed. Does anyone have MC suggested answers?
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Looking at the past couple of years the percentage for an A+ hasnt really changed by that much so youd probably be looking at 80-84% id say. But who knows.
where can you find past year's results and things?
Also how does it kind of correspond to like a predicted study score??
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where can you find past year's results and things?
Also how does it kind of correspond to like a predicted study score??
just look up VCE biology "whatever year you want" grade distributions. Its all there.
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where can you find past year's results and things?
Also how does it kind of correspond to like a predicted study score??
if you search up the year you want + 'biology grade distribution" theres a pdf that shows you the mark allocations that corresponds to each grade for each graded assessment (so graded assessment (ga) 1 is unit 3 coursework, ga 2 is unit 4 coursework and ga 3 is the exam)
generally i've heard you need an A+ on all 3 graded assessments to get a 40+ ss but you never know for sure...it's different every year and theres no guarantee that it'll get you a specific ss especially considering scaling etc so yeah :)
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Does anyone have suggested answers for the mc?
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Does anyone have suggested answers for the mc?
nope sorry :/
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if you search up the year you want + 'biology grade distribution" theres a pdf that shows you the mark allocations that corresponds to each grade for each graded assessment (so graded assessment (ga) 1 is unit 3 coursework, ga 2 is unit 4 coursework and ga 3 is the exam)
generally i've heard you need an A+ on all 3 graded assessments to get a 40+ ss but you never know for sure...it's different every year and theres no guarantee that it'll get you a specific ss especially considering scaling etc so yeah :)
Aaaaaa thank you :) guess we can only wait and see aye :)
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Aaaaaa thank you :) guess we can only wait and see aye :)
no worries!!! and yeppp just gotta wait and see i guess hahah :)
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how did everyone do the denisovan question? and what did vcaa want us to write to justify where we drew the line :o
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how did everyone do the denisovan question? and what did vcaa want us to write to justify where we drew the line :o
I branched it halfway down the neanderthal line and said that they've got similarities to neanderthals but enough differences to be considered seperate or something
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Also, for the question about the lactase mutation stuff, what sort of mutation did you guys say it was? I said germ line mutation
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I branched it halfway down the neanderthal line and said that they've got similarities to neanderthals but enough differences to be considered seperate or something
ah crap i branched it before neanderthals... massive brain fart right there
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Does anyone have suggested answers for the mc?
really need this haha :/
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Also, for the question about the lactase mutation stuff, what sort of mutation did you guys say it was? I said germ line mutation
I said point/substituion mutation bc in the question it said cytosine was replaced with thymine. You'd probably still get the mark tho bc the mutation had to be inheritable
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I said point/substituion mutation bc in the question it said cytosine was replaced with thymine. You'd probably still get the mark tho bc the mutation had to be inheritable
Couldn't it have been an inversion? Inversion could result in a single amino acid change
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Couldn't it have been an inversion? Inversion could result in a single amino acid change
i dont think so bc inversions usually involve large chunks a chromosome being reinserted 180 degrees whereas this one was just a single nucleotide. pre sure they didn't mention any amino acid change either?
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Also, for the question about the lactase mutation stuff, what sort of mutation did you guys say it was? I said germ line mutation
hmm i said point substitution mutation bc it was just a substitution i thought, no frameshift
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Ah darn I didn't realise it said a base substitution... Reckon they could still accept germ line or nah? If they're specifically looking for point
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Hey guys, I was wondering what people wrote for the last question in regard to the safety precautions?
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Hey guys, I was wondering what people wrote for the last question in regard to the safety precautions?
I wrote something about avoiding sources of electrical conduction such as metal since you are using electric current to run the gel electrophoresis. I also wrote wearing a long-sleeve lab coat or safety goggles. I feel like when they asked for safety precautions they are referring to the approaches to avoid potential hazards or dangers.
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Hey guys, I was wondering what people wrote for the last question in regard to the safety precautions?
i was quite stumped with this one
1. electrical safety with the current that was being run through the gel and keeping the equipment away from water
2. (hahaha i was so stumped), maintaining saftey precautions with the heating equipment that keeps the temp constant and ensuring that it is set to the correct temperaure (cuz too high could burn you)
thats what i wrote (not too great ik but it was such a not VCAA type question smh) :)
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i was quite stumped with this one
1. electrical safety with the current that was being run through the gel and keeping the equipment away from water
2. (hahaha i was so stumped), maintaining saftey precautions with the heating equipment that keeps the temp constant and ensuring that it is set to the correct temperaure (cuz too high could burn you)
thats what i wrote (not too great ik but it was such a not VCAA type question smh) :)
LKMAO i literally wrote dont touch the gel while the current is running and wear a lab coat and glasses. hopefully they are gonna accept a range of answers lol
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Alright here's the thing. With the Denisovans question where u draw a branch, surely they allow a range of response as long as its possible for Denisovans to interbreed with Homo sapiens. That part of the study design is literally about how the evolutionary tree is up to interpretation soooo there can't really be a wrong (unless you draw Denisovans in a way where they couldn't interbreed with H sapiens. I guess it would make sense for VCAA to accept anything as well as it is justified well?? idk
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Alright here's the thing. With the Denisovans question where u draw a branch, surely they allow a range of response as long as its possible for Denisovans to interbreed with Homo sapiens. That part of the study design is literally about how the evolutionary tree is up to interpretation soooo there can't really be a wrong (unless you draw Denisovans in a way where they couldn't interbreed with H sapiens. I guess it would make sense for VCAA to accept anything as well as it is justified well?? idk
i agree i think you just gotta draw the line up until it levels with neanderthal and homo sapiens
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i agree i think you just gotta draw the line up until it levels with neanderthal and homo sapiens
I don't think level. The neanderthal line should not have gone that far either. Those species are extinct so the line would finish earlier. Their tree was incorrect for both diagrams and hence the denisovans line should be able to yes interbreed but definitely not continue to the same point as the others.
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I don't think level. The neanderthal line should not have gone that far either. Those species are extinct so the line would finish earlier. Their tree was incorrect for both diagrams and hence the denisovans line should be able to yes interbreed but definitely not continue to the same point as the others.
Since they drew neanderthal to same level as H sapiens it should be fine to do the same with Denisovans. The problem is about where exactly to draw the line for Denisovans.
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Do any of you guys have an idea of what kind of exam score correlates to an approx SS?
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Do any of you guys have an idea of what kind of exam score correlates to an approx SS?
I would recommend looking at the TWM Publications website (here) which has exam score to study score prediction graphs, calculated based on the annual grade distributions and the normal distribution VCAA uses for study scores.
Alternatively you could try keltingmeith's new study score calculator here; which I believe operates on a similar principle.
Or one more option is to use the mean and standard deviation on the actual grade distribution reports. If you assume they're normally distributed you can choose a study score (e.g. 44 SS), figure out how many standard deviations from the mean it is (2 in this case), and then calculate an exam score which is the same amount of standard deviations from the mean (which according to the 2019 grade distribution would be roughly 90% for 44). Hopefully that's helpful.
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what did you guys put for that multiple choice question with the B and T cells having something in common?
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what did you guys put for that multiple choice question with the B and T cells having something in common?
was it not that they both had immunological memory or something i think it was A
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ohh but plasma B cells and cytotoxic T cells don't have immunological memory ?
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ohh but plasma B cells and cytotoxic T cells don't have immunological memory ?
LMAO guess i read it wrong, i just took it as being the adaptive immune system so it was like memory ? but i cant even remember the question at all sorry :/
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LMAO guess i read it wrong, i just took it as being the adaptive immune system so it was like memory ? but i cant even remember the question at all sorry :/
nah ur right. It was the only one that made sense. Since it is talking about B and T cells as a whole, immunological memory makes sense.
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what do you think will be the A+ cut-off for this years exam?
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what do you think will be the A+ cut-off for this years exam?
idk my school's a+ is 91%
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Hey! For the temperature question, was it okay to not put that decreased temperature results in a slower enzyme activity if you put that the optimal temperature has the highest rate of enzyme substrate collisions?
Also for labelling Y in 4ai I put nucleus instead of nuclear membrane.. do you think that's accepted as well?
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idk my school's a+ is 91%
What do u mean ur schools A+ was a 91%?
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Hey! For the temperature question, was it okay to not put that decreased temperature results in a slower enzyme activity if you put that the optimal temperature has the highest rate of enzyme substrate collisions?
Also for labelling Y in 4ai I put nucleus instead of nuclear membrane.. do you think that's accepted as well?
I think their gonna be harsh so for 4aii, I think you'd have needed to say nuclear membrane instead of just the nucleus.
For the temperature question, I said the same thing as you and I feel as if that should be fine, though my teacher has said that you shouldn't imply anything in your answers, which is what we have done.
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What do u mean ur schools A+ was a 91%?
if we get 91% or above our school give us a+
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if we get 91% or above our school give us a+
For the external exams the A+ or other grade you'll see on your statement of results is based on how well you did compared to other students on the exam. Like how a study score is based on your relative performance. VCAA releases the grade cut-offs ones from past years (look up the graded distributions if you're interested). VCAA's grade cut-offs get applied to every student taking that subject's exam in that year.
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was it not that they both had immunological memory or something i think it was A
But T-memory cells aren't in our study design? that's what my school had told us but now I'm not sure
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I think I lost 8-10 marks on the exams...have I kissed my chance of a 40+ study score goodbye?
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I think I lost 8-10 marks on the exams...have I kissed my chance of a 40+ study score goodbye?
Highly unlikely, that should score you a good 40+. I remember thinking I lost around 8-10 marks on the exam (although this was in 2017, and the exam was pretty challenging), and I ended up getting 50.
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Thank you so much waterangel!!
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I think I lost 8-10 marks on the exams...have I kissed my chance of a 40+ study score goodbye?
Just wanted to add that only losing 10 marks on a Biology exam is actually really good haha. That should get you around a raw 45 or 46 (according to last year's grade distribution statistics anyway).
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Wowowowo thank you vce2020!! I feel much better bahahahaha
crossing fingers this year's statistics stay the same as last year's ;D
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No worries haha.
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Sorry if this a bit dumb hahahah, i was wondering how you guys worked out raw study scores from the grade distribution reports? :)
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Hey Guys,
Just wanted to ask what type of study score you think i will get for bio if i was ranked about 6th-9th in the cohort and my average grades are:
GA1- 82%
GA2- 87%
GA3- 72-74% approx.
Thanks.
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Hey Guys,
Just wanted to ask what type of study score you think i will get for bio if i was ranked about 6th-9th in the cohort and my average grades are:
GA1- 82%
GA2- 87%
GA3- 72-74% approx.
Thanks.
Hi there!
I really have no idea (especially the way this year has panned out with the bushfires and covid), but I would think either low 40s maybe? It also depends on how your sacs end up scaling and the strength of your overall cohort though..
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Does anyone know where I can get a copy of the exam? Past student here and curious to have a look :) Hope everyone was happy with their scores!
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Does anyone know where I can get a copy of the exam? Past student here and curious to have a look :) Hope everyone was happy with their scores!
Past science exams can be found here - but you may have to wait a while for the 2020 exam to be put up :)
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When does vcaa usually release the exam report?
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When does vcaa usually release the exam report?
Not for a good few months yet
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Did anyone else think that the Bio exam was suspiciously easy? I'm a bit worried that I found it so easy... it was easier than my past practice exams.
No, I found it pretty easy as well, and was a bit worried that it might have thrown me out of the loop.
Though looking at my study score, I'm gonna go ahead and say that it did.
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