I didn't find it too bad.. The MC were generous I thought, but some of the short answer were a bit tricky! And I found that I was really pushed for time, as in wrote the last sentence when they said pens down.
If anyone can send me a copy I'll do answers for the MCQ for you guys (Y)
Experimental design, molecule synthesis (enzymes), quite a bit on X-linked heredity, we had to draw a pedigree, translation, we had to draw an antibody and mark where they attach to form an antigen-antibody complex, that Otzi iceman guy, effects of bipedalism... some other stuff too.. oh we were examined on the whole rhesus positive/negative shit where they asked what happens when a rhesus negative mother carries a rhesus positive child..
first 10 MC were simple!
VCAA are playing it pretty equivocally this year!
Cant wait for methods!!
-We had to draw a lot (pedigree, antibody, antigen-antibody complex, nucleotide and AMINO ACID)
-Natural selection question
-Bipedalism question concerning human development
-Enzyme function
-Multiple alleles
-Translation
-Quaternary structure
-Experimental design
-Focus on biomacromolecules
That's all I remember :') Much harder than 2013s IMO
Sorry to be annoying but could someone post more detail about the question on translation? I just did the exam but I can't remember such a question and now I'm freaking out...Where it asked for the synthesis of the 'polymer' :)
Where it asked for the synthesis of the 'polymer' :)
The MC question on turgidity and the one on floresiensis confused me... ::)
Yeah same, but I think I ended up picking option D which is when I that thing closes water moved out of Moyer cell by osmosis or something
Yeah same, but I think I ended up picking option D which is when I that thing closes water moved out of Moyer cell by osmosis or somethingYas went with D too, A and B did were incorrect so I was stuck with C and D. Hahaha
Yeah same, but I think I ended up picking option D which is when I that thing closes water moved out of Moyer cell by osmosis or somethingGood, I did the same.
Phew! What did you guys think of the last question on pedigree analysis? The one talking about what the study of traits expressed by the twins may reveal?That was such a tricky question imo...
Phew! What did you guys think of the last question on pedigree analysis? The one talking about what the study of traits expressed by the twins may reveal?
Phew! What did you guys think of the last question on pedigree analysis? The one talking about what the study of traits expressed by the twins may reveal?The twins are genetically identical but they could be phenotypically different as phenotype is influenced by the environment.
Phew! What did you guys think of the last question on pedigree analysis? The one talking about what the study of traits expressed by the twins may reveal?
The one with the female and male diploid? I think that was about the queen bee, and how she produced eggs and if they are fertilised then its a female, whereas if its a male 'drone' its unfertilised and therefore haploid.
yeah i got 16 for the male somatic cell and 32 for the female somatic cell.
And then the question about why male drones exhibit genotypic variation, and how that benefits the species or something like that
What was the experimental design question? I don't seem to remember it.
That was the last question on the polypeptide accumulating in nucleus of a cell
Sooooo....I'm glad I did Biol in 2012 :|
Sooooo....I'm glad I did Biol in 2012 :|
The one with the female and male diploid? I think that was about the queen bee, and how she produced eggs and if they are fertilised then its a female, whereas if its a male 'drone' its unfertilised and therefore haploid.I said 31 and 15 since as it asked for the chromosomes in the somatic cells only. :/ don't tell me i screwed up again. ahhhhh
yeah i got 16 for the male somatic cell and 32 for the female somatic cell.
And then the question about why male drones exhibit genotypic variation, and how that benefits the species or something like that
Sooooo....I'm glad I did Biol in 2012 :|2012 exams were sooo much easier IMO haha
I said 31 and 15 since as it asked for the chromosomes in the somatic cells only. :/ don't tell me i screwed up again. ahhhhhYeah I did 30 and 15 because it was somatic? Is that wrong?
I said 31 and 15 since as it asked for the chromosomes in the somatic cells only. :/ don't tell me i screwed up again. ahhhhh
I said 31 and 15 since as it asked for the chromosomes in the somatic cells only. :/ don't tell me i screwed up again. ahhhhh
What did you guys put for the two effects on behavior of bipedalism??Manipulation of tools and surroundings because of free hands
Well there goes another mark. :'(I know that feeling all too well..
I wrote that environmental factors would result in slightly different phenotypes as genetic material would be identical.
I got 16 and 32 too. For the genetic variation I just wrote crossing over or independent assortment and kinda elaborated on them both.
What did you guys put for the two effects on behavior of bipedalism??
Manipulation of tools and surroundings because of free hands
Able to save and conserve energy as bipedalism uses less energy than quadrupedalism thus used elsewhere (sex).
I thought that too. but it says behavioural not physiological so energy conservation wouldn't be an answer I thinkThere goes another mark :')
- The question about the codons and monomers; was it 90x3 + 3x2? (Because of start and stop codons)?Omg I totally didn't realise you needed start and stop codons. I just did 90x3
Doesn't the start codon however code for an amino acid (Met)? So you wouldn't count it in?
You know you're a nerd when you you already knew about Otzi and how he died prior to doing the bio exam today because you read about him in your spare time :P ::)Lucky Otzi's question were pretty straight forward though!
You needed to account for stop codons. Thus=273. Yeah, met is an amino acid.
Lucky Otzi's question were pretty straight forward though!
For the otzi question what did everyone put?
I forgot he was naturally mummified and stated in the burial process other people placed blood on him in the ceremony.
Lucky Otzi's question were pretty straight forward though!
And yep I put 270 nucleotides for the amino acid monomers and 3 for a stop codon. :) Wooo
True! ::)Same, I wrote a fight between him and other organisms (predators or family) which may have left blood over his clothes which he lost thus his death.
I wrote that he got into a fight, resulting in his death (mummified from snow/ice preservation)
What did everyone do for the multiple choice question with the phylogenetic tree asking why the different time periods were different lengths??
What did everyone do for the multiple choice question with the phylogenetic tree asking why the different time periods were different lengths??
Same goes... I was just thinking of Ice Age LOL
I put the one about mass extinction haha.
Seems so wrong though.
I put the one about mass extinction haha.
Seems so wrong though.
I put the one about mass extinction haha.
Seems so wrong though.
Same goes... I was just thinking of Ice Age LOL
what did you guys get for the founder effect multiple choice question? i thought they were all wrong :/It was Migration.
It was Migration.
Ugh some questions on SA were f*cked...
For the bipedalism one, did people put tools and saves energy from more efficient travel --> more migration?
Also is it ok if I wrote nucleic acid and polypeptide instead of DNA and histone protein? It was asking for macromolecules in chromosomes.
One of my poor students thought the end of question 11 was the end of the exam, due to the "this page has been left blank" page, and lost at least 6 marks. :( I hope this doesn't apply to anyone else here!Damn that sucks! Someone please check with me that the last question was on the woolly mammoths?
One of my poor students thought the end of question 11 was the end of the exam, due to the "this page has been left blank" page, and lost at least 6 marks. :( I hope this doesn't apply to anyone else here!
Damn that sucks! Someone please check with me that the last question was on the woolly mammoths?
It was Migration.
I thought it was natural disaster because there was only one genotype in the population that survived. It couldn't be migration that only that genotype migrated could it?
A+ cut off prediction? I think I lost about 13 marks most cause of silly mistakes :( then probs a few more for examiners being harsh
A+ cut off prediction? I think I lost about 13 marks most cause of silly mistakes :( then probs a few more for examiners being harsh
guys for the mammoth question would allopatric speciation get any marks? I was going to change to bottleneck but I didn't at the end..
Did you guys get Xlinked recessive for the pedigree in the short answer ?
Yeah I described allopatric speciation.
Did you guys get Xlinked recessive for the pedigree in the short answer ?
I didn't even think of this! I was going on about a mutation which was advantageous due to some environmental pressures, then natural selection acted to the point that these organisms became reproductively isolated, and the old species died out and was replaced by the new one. Definitely 0 marks.
Yeah I talked about mutation as well. I thought allopatric speciation would result in divergent evolution so it would be branched out rather than leading straight to that new variation
Hey guys! Will be posting a copy of the exam in about 10 mins while I scan all the pages. I managed to sneak a spare from the assessor ;D
I was so confused about that one - i said natural selection too, but i said that climate was the selection pressure - so unsure about that haha
Hey guys! Will be posting a copy of the exam in about 10 mins while I scan all the pages. I managed to sneak a spare from the assessor ;D
I talked about natural selection/mutations because, as you've mentioned, it didn't branch out but rather evolved in a linear fashion, hence NS.
I was so confused about that one - i said natural selection too, but i said that climate was the selection pressure - so unsure about that hahaLet's hope it was NS, for my sake ;)
Hey guys! Will be posting a copy of the exam in about 10 mins while I scan all the pages. I managed to sneak a spare from the assessor ;DMVP!
With the drawing of the antigen-antibody complex, could both antigen-binding sites be bound to the same antigen???
Not the same antigen, no.
Not the same antigen, no.It can be with the same pathogen though right?
Aww...We never learnt that at school so that's more marks lost! :'( :'( :'(
It can be with the same pathogen though right?
Wait, do you mean both antigen binding sites on the same antibody to 1 antigen?
That's so annoying :-\ Don't worry though, the exam was so much harder than usual so the A+ cutoff should be lower :)
Yep! I didn't draw it like that though, so hopefully agglutination wasn't 'required' per se.
UPDATE: sorry for the hold up. running into tech difficulties, the file is too large even when compressed :'(
GUYS. How do you think you went? Honestly, I don't know. Might loose marks here and there for lack of specificity. What'd you guys say for the last question and the one about the twins. What questions did you find hard?For the twins one I took a wild guess and said they would share the similarities in genes and protein production however there still will be genetic differences as no individual is identical (unless cloning took place) thus phenotypic differences.
Nonetheless, Biology has been one of the greatest subjects, definitely going to miss it :'(
Both my antigen-binding sites of the antibodies were attached to two adjacent antigens on the same pathogen... Is that wrong?
For the twins one I took a wild guess and said they would share the similarities in genes and protein production however there still will be genetic differences as no individual is identical (unless cloning took place) thus phenotypic differences.
I don't think so, I mean that's how they agglutinate! Take a look at this diagram from the BIOL Notes book
Didn't the question ask why would there be genotypic differences? I thought about saying environmental influences but environment doesn't effect genotype? I said that processes such as crossing over and independent assortment that happen in meiosis causes genotypic differences. But that was a 2 mark question. I think the other mark was for stating mutations occurred which I didn't state. Last minute question for me -.-.
WHAT in the hell was the experimental design question!? how'd u guys go about that curveball?
here we go, more coming :)
here we go, more coming :)
Wait are you talking about the twins or the bees?
The twins are identical - hence they have identical genotypes. However, the question stated that the traits were being studied after 20 years. So although genotypes may be similar, some phenotypic expression may be different due to environmental factors affecting phenotype.
I don't think so, I mean that's how they agglutinate! Take a look at this diagram from the BIOL Notes book
It was such a struggle to draw this because I drew it in detail such as the heavy chain with the hinges and stuff... if this is what they required then I surely just wasted my time..
Why are they getting removed?
Why are they getting removed?^
Why are they getting removed?
Is the founder effect definitely migration?
CAN SOMEONE PLEASE PUT UP SHORT ANSWER QUESTIONS AS WELL PLEASE?pls no it'll put me off haha
Why are they getting removed?
Really sorry guys, but they are copyrighted material. VCAA does have a bit of a reputation for being a little bit, sensitive, about copyright so in the interests of ATARNotes and milica96 I have had to remove them. Thanks a heap to milica96 for putting them up.Thanks!
PS: I will be checking through the answers to let those of you who got them know whether they were all hunky-dory :)
HOW IS 38 artificial selection PLZ HELP
also think i stuffed at 32. ehhhh
Can someone explain why its artifiical....
38/40
As humans have intervened with the selection process by domesticating dog breeds, it becomes artificial as it's not really natural selection which involves environmental agents
THE VCAA PUBLISHES ALL THE EXAMS ON THE INTERNET WHEN THEY ARE DONE AS WELL AS THE MULTIPLE CHOICE AND SHORT ANSWERS REPORT. THEY ARE NOT THAT SENSITIVE.You need to relax my friend! HAHAHA :P
As humans have intervened with the selection process by domesticating dog breeds, it becomes artificial as it's not really natural selection which involves environmental agents
What could the 3 marks for the polypeptide experiment design question have been?
You couldn't mentioned controlled variables or large groups, as they specifically stated this.
I think one was for repetition of experiment, one (maybe) for sensible design that would test the hypothesis... but I'm not sure what else
Also, anyone know when vcaa or a legally allowed body actually uploads the exam online?
What could the 3 marks for the polypeptide experiment design question have been?
You couldn't mentioned controlled variables or large groups, as they specifically stated this.
I think one was for repetition of experiment, one (maybe) for sensible design that would test the hypothesis... but I'm not sure what else
Also, anyone know when vcaa or a legally allowed body actually uploads the exam online?
I did
- two large groups of polypeptides, one with lys in third sport and one with not-lys in third spot
- insert groups in cells
- stating which results would support hypothesis
How did you mention the insertion of the cells? It was so confusing. I said they were inserted with a liposome... ugh. Such a convoluted question...
How did you mention the insertion of the cells? It was so confusing. I said they were inserted with a liposome... ugh. Such a convoluted question...
I did
- two large groups of polypeptides, one with lys in third sport and one with not-lys in third spot
- insert groups in cells
- stating which results would support hypothesis
How did you mention the insertion of the cells? It was so confusing. I said they were inserted with a liposome... ugh. Such a convoluted question...
Pretty sure it was stated in the question stem on the previous page
From what I got out of that question, vcaa was telling us 'we got your back' in terms of the insertion, so I don't think that would've been important.
Did anyone else use fluorescent polypeptides?
YES USED the labelled polypeptides. Just had so much struggle with piecing it together ;n;
- insert polypeptide in the nucleated gene; record accumulation activity.
Almost said 'use gene probes', gosh that was tricky.
Also the question about amino acid differences, you (probably) had to relate that to mutations in DNA since amino acids cannot just change by themselves. Thought that was sneaky too.
I just said;
- creat two large groups where one is the control - with lys.
- insert polypeptide in the nucleated gene; record accumulation activity.
- if there is accumulation with group 1 and not with group 2 then the hypothesis is supported.
What? You mean cell?Yes cell haha
This is EXACTLY what I wrote down, haha.Let's hope we're right :P
Are you sure?
I just thought that you had to explain that we know what rate they mutate at, hence we can derive molecular clock. More changes in amino acid = more mutations = more time since species divergence = more unrelated two species are.
Essentially yes, but amino acids cannot mutate, so unless you relate it to DNA I can't see how the argument makes sense
I completed butchered the experimental design question :'( I initially wrote two groups but then changed it and wrote 8 groups of cells LOL 1-7 inserted with polypeptide chains that had lys in different positions and the 8th group without any polypeptide inserted. Then I mentioned how the results should show that only the group of cells which had a polypeptide inserted with lys in the position it needed to be in (2nd or 3rd? don't remember ahah) would show accumulation, thus proving the scientist's hypothesis. I also had like repetition and whatnot...just ahh, so annoyed at myself :-\
Don't worry, as long as you've included relevant info you can still get the marks
I agree with the solutions posted, except question 20.
I put down C, but is that correct for Meiosis instead?
40/40 on MC. What even. :o
40/40 on MC. What even. :o
This one's getting a 50. I'm calling it now.
Killing it. Congratz.
Well done everybody!
Congrats, beat be by one :P
That bloody turgid/potassium question killed me, I stared at it for 5 mins and didn't get it. Still doesn't make sense to me now :o
is there a copy of the exam somewhere? if so how do you open it?In the original post, there's a hyperlink :)
In the original post, there's a hyperlink :)
(Also - does everyone still agree with the original answers in the OP? - has there been any changes?)
Can someone explain to me how it was a substation mutation in a gamete and not a somatic cell? question 23 if i recall correctly.
I though since the question said there are individuals (emphasising the plural) with this mutation, this indicates that the mutation does not apply to only one individual, hence for it to be passed on to other individuals (offsprings) it has to be a mutation in the gamete.Ah I see... didn't pick up on that! :(
Could someone explain how question 19 is cytotoxic t cells, because I thought cytotoxic T cells only killed virus infected cells?The Cytotoxic T cell binds to the MHC markers on the transplanted cells and recognises it as non self, where it is destroyed. They destroy anything, as long as it's a cell (eg. cancer cells, viral infected). Normally, in the person's body (from where the transplant came from), there would be no response since the MHC markers are theirs, but in a different person, it is not recognised as self and therefore tissue rejection happens.
Predicted cut off anyone?
87-88
Since this years exam was clearly harder than last years, do you think this will lead to an increase in scaling as well?but wouldn't that assume that the other exams were easier than?
Since this years exam was clearly harder than last years, do you think this will lead to an increase in scaling as well?
87-88
Since this years exam was clearly harder than last years, do you think this will lead to an increase in scaling as well?probably not. depends on cohort strength.
Wasn't last years cut off ~85%? Why would it be higher if was harder? :SI'm guessing it's 88/110
Possibly, but its been stuck at +1 for the past few years. If it is going to go up, I'd only be by +2.
Wasn't last years cut off ~85%? Why would it be higher if was harder? :S
What did everyone write for the ZZ and ZW chromosome question?
What SS Am i looking at if i get a low A+ with A+ sacs and rank 1?
Can anyone explain question 12 of MC?
Z^R Z^r X Z^r WThank God! At first I did Rr x rr but then changed it haha. I think I went with Z^R Z^R X Z^r W though...
ceebs typing it out, but thats the cross i did
Hey what did you guys write for the facilitated diffusion question? I feel like some of the questions were broad and ambiguous.I just said the accumulation of glucose inside the cell is high concentrated so through facilitated diffusion it wants to rebalances the low levels of glucose outside hence diffuses (high to low concentration gradient) I had to retain this memory from units 1 and 2 tbh.
Z^R Z^r X Z^r W
ceebs typing it out, but thats the cross i did
Crap, as if pyruvic acid can be used exactly the same way as the ion (pyruvate), thought it was some other path haha so didnt see any O2 so i chose B damn! 38/40Better than my 35 ._.
That question 20 got me ahaah
Better than my 35 ._.
Did everyone say carrier protein for glucose (talk about conformation change?) and moving from high conc to low con? (with concentration gradient) for that question?? I nearly said through a protein channel but got lucky in remembering that its carrier for glucose and channel for ions and such (smaller).
Fak i said protein channel -_-
oh dear this isn't looking so good anymore
I don't get why 270 is wrong, if you were to count the start and stop codons (bases that code for a acids which aren't actually part of the polymer) then why stop there? Why exclude the promoter sequence, and the other bases that get added to it (adenine tail, methylated cap?) I reckon it was 270, only because it used the word 'coding'.
"Stop codons signal the termination of this process by binding release factors, which cause the ribosomal subunits to disassociate, releasing the amino acid chain. While start codons need nearby sequences or initiation factors to start translation, stop codon alone is sufficient to initiate termination." - wiki
Stop and Start aren't translated :-\
To be honest, I reckon they would accept either protein channels or carrier proteins. Maybe not though, dunno.
I don't get why 270 is wrong, if you were to count the start and stop codons (bases that code for a acids which aren't actually part of the polymer) then why stop there? Why exclude the promoter sequence, and the other bases that get added to it (adenine tail, methylated cap?) I reckon it was 270, only because it used the word 'coding'.
"Stop codons signal the termination of this process by binding release factors, which cause the ribosomal subunits to disassociate, releasing the amino acid chain. While start codons need nearby sequences or initiation factors to start translation, stop codon alone is sufficient to initiate termination." - wiki
Stop and Start aren't translated :-\
I don't get why 270 is wrong, if you were to count the start and stop codons (bases that code for a acids which aren't actually part of the polymer) then why stop there? Why exclude the promoter sequence, and the other bases that get added to it (adenine tail, methylated cap?) I reckon it was 270, only because it used the word 'coding'.
"Stop codons signal the termination of this process by binding release factors, which cause the ribosomal subunits to disassociate, releasing the amino acid chain. While start codons need nearby sequences or initiation factors to start translation, stop codon alone is sufficient to initiate termination." - wiki
Stop and Start aren't translated :-\
For the glucose question, I said something like
glucose is unable to pass directly through the phospholipid bilayer, so it must pass through the membrane through specific protein channels embedded in the membrane.This process does not require energy.
I wrote:
90 amino acids, and 3 nucleotides per amino acid hence 90*3=270
However, add 3 nucleotides for STOP codon
Therefore 270+3=273 bases needed
Same, however I said that it goes with its concentration gradient instead of not requiring energy.
I think that's implicit anyway, but yeah should have wrote that.
Exactly! I feel like I should have written that it doesn't require energy :') ahaha
can anyone remember their phenotype and genotype ratios for those two questions??? :)
For the ZZ x ZW question, pretty sure phenotypic was just 1 of eachWoooooo!!
For the Bb^1b question, I think phenotypic was 2 purple: 1 lilal: 1 white
For the ZZ x ZW question, pretty sure phenotypic was just 1 of eachYeah thats what I thought!
For the Bb^1b question, I think phenotypic was 2 purple: 1 lilal: 1 white
Woooooo!!
Do you make mention of the gender too in the phenotype?
Damn.. I thought they were trying to trick us with that question... I guess it was more straightforward then I thought.
I wrote:
90 amino acids, and 3 nucleotides per amino acid hence 90*3=270
However, add 3 nucleotides for STOP codon
Therefore 270+3=273 bases needed
What did you all say for the making more copies of Otzi's DNA question?
Did everyone say Otzi was involved in a mass cult suicide?
jks aside, you said bar fight and he was left in the snow yeah?
Did everyone say Otzi was involved in a mass cult suicide?
jks aside, you said bar fight and he was left in the snow yeah?
I said ''it was hypothesised that he was in a fight with three other individuals''
What did you guys say for the pancreas/liver SA in regards to the hormone stimulating the process within the cell?
I did
- two large groups of polypeptides, one with lys in third sport and one with not-lys in third spot
- insert groups in cells
- stating which results would support hypothesis
Maybe VCAA will be nice and award everyone full marks for that question ::)
Ha...Ha....Ha...
Hey guys are these answers 100% verified because for question 12 it seems like the answer would be B rather than D? If I'm wrong could someone explain why it would be D? Thanks :)Yeah I put in B... but it seems like everyone put in D and the explanation seems legit. Meh.
Maybe VCAA will be nice and award everyone full marks for that question ::)Crazier things have happened...wait no... nothing is crazier than that.
Hey guys are these answers 100% verified because for question 12 it seems like the answer would be B rather than D? If I'm wrong could someone explain why it would be D? Thanks :)
It's not unheard of, a few VCAA past exams I did gave full marks to everyone if the question wasn't clear.
Crazier things have happened...wait no... nothing is crazier than that.
The conversion of pyruvate to acetyl-CoA is a part of aerobic respiration, as pyruvate oxidation is included in the krebs cycle in VCE bio :)
It's happened...Oh wow, I take it back.
It's happened...
I'm so angry at myself because of the amino acid question.
Apparently the answer to the number of nucleotide bases was 273 including the stop codon.
Did anyone else write 270?
I'm so angry at myself because of the amino acid question.
Apparently the answer to the number of nucleotide bases was 273 including the stop codon.
Did anyone else write 270?
I'm so angry at myself because of the amino acid question.I wrote 270 nucleotides for the monomers and 3 nucleotides for a stop codon. I didn't say '273' per se, but I hope it suffices haha.
Apparently the answer to the number of nucleotide bases was 273 including the stop codon.
Did anyone else write 270?
Why? Hardly anyone I know got the full mark for drawing an amino acid... TBH as I've said before that there is a tiny chance that VCAA turn around and say "hey look, kids who did chem 3/4 had a major leg up on kids who haven't done it, so we'll give everyone the mark"
And lots of other people wrote 270
I also had a look in the study design, and nowhere does it say that we need to know the exact structure of an amino acid.
I honestly didn't even know what to draw. My mind just went completely blank because i never thought they would actually ask that. I drew a diagram which included the carboxyl group, the amine group, the R group and the hydrogen group and forget about the carbon group. Mind you, they were all over the place. I really wish they give us all full marks for that one. I'm so devastated :(At least you drew something! :P
At least you drew something! :P
What did you do for that question?DNA - drew a nucleotide. HAHA screwed.
DNA - drew a nucleotide. HAHA screwed.
Nah you're right. It asked us to draw both monomers of the macromolecules.
And I don't know why but I have the feeling that 3 out of the 4 marks may be for the nucleotide because it's got 3 parts so I hope we got that right atleast :)
Wait wasn't two marks for naming nucleic acid/polypeptide and another two for the monomers?
Edit: We didn't have to name the monomers did we? Just draw them?
I think we did if I'm not mistaken. Because the first part asked us to name 'macromolecule 1' and 'macromolecule two'
But you probably got it right, the stress is just getting to us right now. :P
Did anyone manage to get a copy of the short answer? This is the part I'm mainly interested in seeing.@milica96 said she'll put up the SA tomorrow.
I honestly didn't even know what to draw. My mind just went completely blank because i never thought they would actually ask that. I drew a diagram which included the carboxyl group, the amine group, the R group and the hydrogen group and forget about the carbon group. Mind you, they were all over the place. I really wish they give us all full marks for that one. I'm so devastated :(
So how did it go? Was it harder than last year's exam?
Proposed answers within the spoiler!Spoiler1 C
2 C
3 A
4 B
5 B
6 A
7 B
8 D
9 C
10 A
11 D
12 D
13 C
14 C
15 B
16 A
17 D
18 C
19 B
20 A
21 D
22 A
23 B
24 C
25 A
26 B
27 A
28 B
29 C
30 B
31 D
32 C
33 A
34 C
35 D
36 A
37 C
38 D
39 B
40 C
>>Here<< is a copy of the 2014 MCQ. Thanks a heap to milica96 for taking the time to scan the exam and to write her answers on it. Credit to Mr T-RAV for hyperlinking the OP and verifying answers.
for 27 though it said they were distantly related, so how could it be A?Read the rest, it says "from different families" I thought the same until i read the whole question haha.
Read the rest, it says "from different families" I thought the same until i read the whole question haha.
Just to add to this, it also says distantly related as opposed to 'recent common ancestor'. Every organism is distantly related theoretically, so the keyword 'recent' is missing which infers convergent evolution (especially when considering the structures with similar purposes)
I thought it was natural disaster because there was only one genotype in the population that survived. It couldn't be migration that only that genotype migrated could it?
Hey for the CTP question, would it be okay to say something along the lines of when CTP is in high concentration, the repressor protein would bind to the promotor to stop ATCase(?) production? I had written that CTP would bind to the ATCase enzyme but later crossed this out . . .
Can someone please explain question 36? About the geological timescale? I don't get why it's A. I put down C, anyway.
Can someone please explain question 36? About the geological timescale? I don't get why it's A. I put down C, anyway.
Hey guys, I just did my own rough marking of the exam, and I got around 80-85%. I got high A+ for my sacs. Does anyone want to estimate what I may get?
I'm not too please with my exam but am hoping to get 38-40, do you think these marks will get me that?
Slowpoke here, is there a copy of the short answer questions floating around somewhere in these 20 pages?
Literally look up 4 posts ::) :Pdo you think people will believe me if I say I posted that from page one? :-X
do you think people will believe me if I say I posted that from page one? :-X
Maybe ;)
Hey guys. Speaking from a too unrealistic and overly optimistic point of view, how many marks can one afford to lose if they want to get a 50?
I'm starting to think that the question where they asked us to draw an amino acid technically shouldn't have even been allowed to be asked, VCAA haven't specified it on the study design or a Biology FAQs page, even when structures of glucose and the structures of proteins in terms of primary, secondary etc. are specified.
How likely they will pick up on this and give everybody the mark?
With the karyotype question, would it be okay to say "the person only had one sex chromosome, and they should have two." Because wasn't the single chromosome in the position where the X chromosome should be????
Have linked the SAQ to the original post too.
Depends on the year. Very, very few though. Once you get into the 40s, there's really not a lot of difference between the students. Kind of sad really.
I'm starting to think that the question where they asked us to draw an amino acid technically shouldn't have even been allowed to be asked, VCAA haven't specified it on the study design or a Biology FAQs page, even when structures of glucose and the structures of proteins in terms of primary, secondary etc. are specified.
How likely they will pick up on this and give everybody the mark?
That should be fine. It's an odd place to put X though...
For multiple choice question 33, why is the answer A (migration) ??
I don't maybe im just thinking too deep into the question but I thought that answer would be B (natural disaster) because I interpreted that the whole arrow kinda represented the process of migration and then event x was something that prevented further gene flow??
Did anyone think the same?
I don't think that they will give everyone a mark because it's in your textbook and, although not explicitly stated in the SD, the monomers of biomacromolecules are emphasised. I think our cohort was just unlikely because it looks like VCAA are stepping up their game :-\
It's representing the founder effect which has nothing to do with natural disasters (that's the bottleneck effect). Migration is the only viable answer essentially.oh okay yeah I knew that it was referring to the founder effect but the way they put in the line for event x made me misinterpret it
That's so annoying :-\
For multiple choice question 33, why is the answer A (migration) ??
I don't maybe im just thinking too deep into the question but I thought that answer would be B (natural disaster) because I interpreted that the whole arrow kinda represented the process of migration and then event x was something that prevented further gene flow??
Did anyone think the same?
It is; but it's just the nature of VCE.
It actually isn't so bad for Biology - if I recall correctly people lost 5 marks on the exam last year and still walked away with a 50; back in the old study design people lost 3-4 marks on each exam and got 50s. If this year's exam was harder (and it seems slightly harder than 2013) perhaps even a few more marks can be lost. This definitely isn't the case in other subjects, where 1-2 marks lost can have a relatively large impact. It's still competitive though, because the reason for "large" number of marks lost corresponding with top study scores still is that Biology has an incredibly pesky marking scheme, particularly when it comes to wording.
I don't think that they will give everyone a mark because it's in your textbook and, although not explicitly stated in the SD, the monomers of biomacromolecules are emphasised. I think our cohort was just unlikely because it looks like VCAA are stepping up their game :-\What burns more is that I know how to draw it cause of chemistry but I didn't identify it :(
What were some other peoples answers for SA Question 12 Part B ii? :)
The question specifically referred to founder effect, which is caused by migration.
Overall I found the exam pretty good. MC was very easy (I hope, or else I'm absolutely screwed) and whilst a few short answer questions threw me off (how da fuck do you draw an amino acid) it wasn't too bad.
What were some other peoples answers for SA Question 12 Part B ii? :)
infecthead. I have the multi choice scan up and the question does not mention founder effect at all. it simply says it shows the changes in allele frequencies over two generations. so I have no idea what the answer is...somebody help!
What burns more is that I know how to draw it cause of chemistry but I didn't identify it :(
"If the diagram above models the founder effect"
Bottleneck effect is a form of founder effect though! I mean it's not conincidence that the smaller population only had one type of genotype. my thought process was that that genotype was able to survive the natural disaster hence there only being one genotype..
They're distinct. Functionally, they do the same thing, but they are distinct. Founder effect is the result of migration, whereas bottleneck is the result of a mass death (naturally induced or human induced)
i thought when i did the paper that migration meant when members of a population bred with another, whilst founder effect was members colonising a new area, so thought migration didn't refer to founder ... oh well guess i know what migration actually means now :P
They're distinct. Functionally, they do the same thing, but they are distinct. Founder effect is the result of migration, whereas bottleneck is the result of a mass death (naturally induced or human induced)
mmm i don't know..that's what our teacher taught us. She reckons the answer is bottleneck (natural disaster). I mean why else would the new population conincidently only have the homozygous recessive genotype. It's not like they somehow all migrated and didn't let anyone else go with a different genotype. Wikepedia says that the bottleneck can cause the founder effect even though it's not strictly a new population
It is possible that they didn't let anyone else go with a different genotype. What if the homozygous recessive conferred a greater capacity to travel (better stamina, more developed hippocampus etc)? Then those without the genotype may very well be excluded.
Do you mean 1bii?
Yeah sorry my bad! Had a lot of questions asking about it... I simply thought that the synthesised product (I forgot its name now) attaches to the allosteric region of the ATCase --> active site shape changes --> cannot properly bind to A and B substrate, production rate of D decreases as a result.Yeah I wrote that the high production of CTP inhibits the rate of the enzyme ATCase in which the production of D is regulated in a decrease - thus an equilibrium. I didn't put much detailed into it however realising it was worth 3 marks now I wish I did haha
^ in simplified terms, of course.
What did everyone write for question 3 in short answer? And was question 10 part a and b both monohybrid crosses? (if not then I am so dead :-\)For 3a. I wrote about the binding to a plasma membrane receptor because of the hydrophilic property of the hormone. This initiates secondary messengers in which signal transduction takes place - cascade of events/chemical reactions. This then stimulates glycogenolysis where glycogen is converted to glucose. Glucose then leaves the liver going into the blood.
I feel so relieved now that someone else answered question 3 the same way as I did. TBH I only learnt that secondary messenger thing like 5 days ago.Yeah, I just hope VCAA accepts varying answers cause it seems like their assessor's report is pretty standard.
I'm just so worried about that experimental design question :-\ I overthought it way too much. I included the elements necessary in those kind of questions, but my experiment was rather strange ahaha ahh :'(Yeah definitely. Especially when they gave half of the experiment and so we had to explain other factors ugh
Yeah sorry my bad! Had a lot of questions asking about it... I simply thought that the synthesised product (I forgot its name now) attaches to the allosteric region of the ATCase --> active site shape changes --> cannot properly bind to A and B substrate, production rate of D decreases as a result.Yeah this is exactly what I wrote, but I wasn't sure if we had to specify non/ competitive inhibition
^ in simplified terms, of course.
Yeah definitely. Especially when they gave half of the experiment and so we had to explain other factors ugh
That's what confused me so much! They had already performed the experiment so I was thinking what? ahh oh well, I think my experiment will at least be original :') 8 groups of identical cells...LOL.20 groups here LOL
20 groups here LOL
Hey guys. For the question regarding number of nucleotides in mRNA strand to form 90 monomers, I wrote that one codon= one monomer. And I knew that they were trying to trick us, so I wrote +starting codon. However, I dont know what I was thinking but I accidentally wrote down the number of codons instead of the number of nucleotides. To make matters worse, I combined the number of codons (90) with the number of nucleotides in the starting codon 3. Considering I showed all working do you think I may still get one mark?
Tough to say, I think they'll give one mark for saying 270 nucleotides = 90 amino acids, and one mark for saying there would be 273 nucleotides total as you have to account for the stop codon, which doesn't code for an amino acid (the start codon does however, so that's part of the 90 amino acid chain).
Wasn't one mark allocated for the number of nucleotides and one mark for the explanation?
Either way, I hope they give us atleast one mark :)
mmm i don't know..that's what our teacher taught us. She reckons the answer is bottleneck (natural disaster). I mean why else would the new population conincidently only have the homozygous recessive genotype. It's not like they somehow all migrated and didn't let anyone else go with a different genotype. Wikepedia says that the bottleneck can cause the founder effect even though it's not strictly a new population
i reckon they will accept a wide variety of answers for this (like within 270,273,276 range)I feel like they'll purposely won't hahaha
Hey guys, I know you don't like people asking these questions, but I'm just curious. I have around 85% SAC average and I'd probably be in the 5-10 rank range (out of about 50), and I think I'll probably pull of around a 90% on the exam. Do you think this will be enough to get me to a 40 SS?Considering the exam was much harder this year, yas.
Considering the exam was much harder this year, yas.
Hey guys, I know you don't like people asking these questions, but I'm just curious. I have around 85% SAC average and I'd probably be in the 5-10 rank range (out of about 50), and I think I'll probably pull of around a 90% on the exam. Do you think this will be enough to get me to a 40 SS?
94% so around 103/110 was already high 40s last year
so if you got 90% you should be mid-high 40s this year :)
What would a 85-90% equate to?
How many marks can you approximately lose to get a 40 raw?
Given that your SAC avg is around 90%
On the topic of studyscores, what would I have to get on the exam to get a studyscore of 35 or 40?(sac avg 84%). I know how the grading changes, but around about what would get me a 35?
are there answers to the Short Answer? so keen to find outThe download is on the OP. :)
Does anyone have a copy of the multiple choice answers?https://www.mediafire.com/download/7byjfrtq2vjl2d6/CCF31102014_0001.compressed.pdf
https://www.mediafire.com/download/7byjfrtq2vjl2d6/CCF31102014_0001.compressed.pdf