VCE Biology Question Thread

[solution]

I copied the answer off VCAA

Next time, post the question. 2007 Exam 1
In the design of the vaccine, what feature prevents the virus-like particles infecting cells and causing
disease?
The lack of nucleic acid; therefore the host cell cannot be programmed to replicate viruses.

The question says "virus-like" not "virus". The question is not about the virus, but it is about the vaccine. The virus-like particle has antigens from the virus (as it still has a protein coat) so memory cells are produced for long term immunity.

[alastair.98]

HI
Was just wondering on the exam are we allowed to write mRNA, tRNA and mtDNA or must we define the terms first?
Thanks

[sweetcheeks]

HI
Was just wondering on the exam are we allowed to write mRNA, tRNA and mtDNA or must we define the terms first?
Thanks

I believe that mRNA and tRNA are acceptable, however my teacher is not 100% sure if mtDNA is appropriate for mitochondrial DNA. I would define it first just in case.

[Gogo14]

For this question would my answer be accepted?
The vcaa answer was that the twins will have the same traits as they are genetically identical, yet difference due to environmental influence.
What does that even mean? 2014 paper btw
Thannnkss
http://imgur.com/gY3cDV9

[Angelx001]

Next time, post the question. 2007 Exam 1
In the design of the vaccine, what feature prevents the virus-like particles infecting cells and causing
disease?
The lack of nucleic acid; therefore the host cell cannot be programmed to replicate viruses.

The question says "virus-like" not "virus". The question is not about the virus, but it is about the vaccine. The virus-like particle has antigens from the virus (as it still has a protein coat) so memory cells are produced for long term immunity.

Oh thank you so much (:

[vox nihili]

I really have no clue but gonna give it a shot

1) A problem with the hypothalamus has caused it to reduce the signals sent to the anterior pituitary to instigate the secretion of the growth hormone , causing less growth hormone to be secreted.
2) the child may have low glucose blood levels  due to malnutrition causing the majority of the growth hormone to follow the chemical pathways which results in an increase in blood glucose levels, hence, less growth hormone follows the pathway in which cartilage growth and bone and tissue growth is instigated causing the child to have growth deficiencies
3) idk lol no clue

most of this was BS but i would like to see if i hit some targets
.

First answer is one the money. Second isn't a bad idea, but hormones really don't have a lot of choice in what they do. If it's increasing blood glucose, it's also increasing growth.

1)The boy has high stress and cortisol levels resulting In the hypothalamus not triggering the release of GH by anterior pituitary gland
2)The boy is malnutrition(ed?) and does not eat enough resulting in the hypothalamus not triggering the release of GH by anterior pituitary gland
3)Receptors on some or most bone and muscle cells responsible for attaching to growth hormone and initiating the 'growth' response are not properly shaped complementory to the growth hormone, thus causing the inability of the 'growth' response
Full guessed but hopefully i hit at least 1 of the marks.

1. Good
2. Malnourished is the way to say it :p not a bad idea, not sure if it's right though. Malnutrition causes these issues because you simply don't have enough energy to grow.
3. Really good too (and a common cause of problems with growth hormone; it even has a name: Laron Dwarfism).


Other options:


-too much somatostatin
-IGF-1 doesn't work
-anti-GH antibodies are circulating
-hypothalamus isn't producing GHRH

[geminii]

Can anyone tell me the difference between a hominid and a hominin, and a few traits that distinguish them from each other? Also, what is a hominoid and do we have to know what it is for the exam?

[solution]

Can someone help me match these command terms to their definition?
Analyse, deduce, determine, evaluate

1. Interpret data to reach conclusions.
2. Find the only possible answer.
3. Reach a conclusion from the information given.
4. Assess the implications and limitations.

[The Usual Student]

hey guys, I never really questioned this but I always presumed that organelles bound by membranes, have phospholipid membranes? Correct?

also can exocytosis and endocytosis be considered means of active transport?

[HasibA]

Can someone help me match these command terms to their definition?
Analyse, deduce, determine, evaluate

1. Interpret data to reach conclusions. analyse?
2. Find the only possible answer. deduce?
3. Reach a conclusion from the information given. determine?
4. Assess the implications and limitations. evaluate?

[solution]

Thanks, I thought those were the right answers. But I thought "evaluate" means more like finding an answer, like "evaluate 2+2". Or maybe I'm doing too much Methods...

[HasibA]

Thanks, I thought those were the right answers. But I thought "evaluate" means more like finding an answer, like "evaluate 2+2". Or maybe I'm doing too much Methods...

i thought that too, but more so, i thought evaluate was strengths and weaknesses/limitations haah :p like both sides of the argument , and then an overall 'opinion' [if this makes sense]

[sweetcheeks]

hey guys, I never really questioned this but I always presumed that organelles bound by membranes, have phospholipid membranes? Correct?

also can exocytosis and endocytosis be considered means of active transport?

Can't help with the first part. Something that I never thought about.

Exocytosis and Endocytosis both require ATP to function, making them forms of active transport.

[alastair.98]

If asked where does the light dependent reaction take place in photosynthesis, would it be better to say Grana or thylakoid membrane or are both accepted?
Thanks

[HasibA]

If asked where does the light dependent reaction take place in photosynthesis, would it be better to say Grana or thylakoid membrane or are both accepted?
Thanks

pretty sure both are accepted, but id choose thylakoid membrane, as its more specific