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March 29, 2024, 07:38:07 am

Author Topic: VCE Biology Question Thread  (Read 3570937 times)  Share 

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Reus

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Re: VCE Biology Question Thread
« Reply #3435 on: October 15, 2014, 05:36:19 pm »
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If a question asks for two examples and you list three, does this limit you from getting full marks? Cause on the assessors report a concern was "Some students gave more than two answers."
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jessica666

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Re: VCE Biology Question Thread
« Reply #3436 on: October 15, 2014, 05:47:41 pm »
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If a question asks for two examples and you list three, does this limit you from getting full marks? Cause on the assessors report a concern was "Some students gave more than two answers."

if they ask for two, list two!! they will most likely only read the first two

shivaji

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Re: VCE Biology Question Thread
« Reply #3437 on: October 15, 2014, 06:16:31 pm »
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in a speciation question, when you say variation existed in the original population, would it be correct to say phenotypic variation, or would you just stick to variation?

Scooby

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Re: VCE Biology Question Thread
« Reply #3438 on: October 15, 2014, 06:54:59 pm »
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If a question asks for two examples and you list three, does this limit you from getting full marks? Cause on the assessors report a concern was "Some students gave more than two answers."

Nah, giving three examples is fine, just make sure none of them are inaccurate, or you'll lose a mark even if two of them are correct
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grannysmith

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Re: VCE Biology Question Thread
« Reply #3439 on: October 15, 2014, 07:02:46 pm »
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If a question asks for two examples and you list three, does this limit you from getting full marks? Cause on the assessors report a concern was "Some students gave more than two answers."
It's okay, but a) they will not consider the third b) wastes time (albeit a little) and c) if the third is incorrect, then you'll probably lose marks on the whole question. I think VCAA usually advises to put your best answers first.

in a speciation question, when you say variation existed in the original population, would it be correct to say phenotypic variation, or would you just stick to variation?
I'd stick with "genetic variation existed in the original population/before selection pressure as... etc." It's probably good to mention the actual variation that existed (e.g. there were already resistant bacteria before the use of penicillin).

A question of my own:
How does the immune system recognise 'self'? Obviously this would include both cells and any kind of protein molecule.

So would it be correct to say that "immune cells have specific receptors that are able to distinguish between different kinds of protein markers (e.g. MHC on cells). If the protein marker is the same as the ones on B and T cells, then the molecule is identified as 'self'. "

But wouldn't other non-specific cells of the immune system (NK cells, macrophages, neutrophils etc.) be able to detect such 'non-self' molecules in the same fashion? Or would it better to stick to the umbrella term of "immune cells'?

And if I wanted to be more specific, would the following be accurate:

"All cells have specific protein markers on their cell membranes. If it is specifically complementary (?) to the Major Histocompatibility Complex (MHC) marker of an immune cell, then it is identified as 'self' cell. If not, then it is identified as 'non self' and a foreign antigen which triggers an immune response."

Surely, the same procedure would be applied to any protein molecule?

Thanks

katiesaliba

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Re: VCE Biology Question Thread
« Reply #3440 on: October 15, 2014, 07:10:19 pm »
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Do cytotoxic T lymphocytes proliferate into memory and effector cells, or is it a T-cell precursor that does?

Also, how accurate is the attached diagram? Is it accurate to say that B and T lymphocytes can proliferate into effector cells without Th cell activation, but to differentiate into memory cells the lymphocytes require interleukin-2 from said Th cells.

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vox nihili

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Re: VCE Biology Question Thread
« Reply #3441 on: October 15, 2014, 07:19:55 pm »
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If a question asks for two examples and you list three, does this limit you from getting full marks? Cause on the assessors report a concern was "Some students gave more than two answers."

A big no-no. Don't give them more than they ask
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kk.08

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Re: VCE Biology Question Thread
« Reply #3442 on: October 15, 2014, 08:50:26 pm »
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What's the difference between a leucocyte and a lymphocyte?
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vox nihili

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Re: VCE Biology Question Thread
« Reply #3443 on: October 15, 2014, 09:28:41 pm »
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What's the difference between a leucocyte and a lymphocyte?

Leukocyte is a white blood cell
Lymphocyte is a group of white blood cells (T-cells and B-cells)
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kk.08

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Re: VCE Biology Question Thread
« Reply #3444 on: October 15, 2014, 09:59:42 pm »
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Leukocyte is a white blood cell
Lymphocyte is a group of white blood cells (T-cells and B-cells)

Thanks! :)
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RazzMeTazz

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Re: VCE Biology Question Thread
« Reply #3445 on: October 15, 2014, 10:32:22 pm »
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Do we have to know about the process of phototropism involving auxins?
Also do we have to know about photoperiodism and the numbers of the inputs and outputs in each stage of photosynthesis and cellular respiration?
« Last Edit: October 15, 2014, 10:35:01 pm by RazzMeTazz »

Tyleralp1

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Re: VCE Biology Question Thread
« Reply #3446 on: October 15, 2014, 10:58:22 pm »
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Do we have to know about the process of phototropism involving auxins?
Also do we have to know about photoperiodism and the numbers of the inputs and outputs in each stage of photosynthesis and cellular respiration?

No, we don't. The FAQ's mentioned we don't need to know anything specific about each Plant Hormone, the effects and the like.

All that relates to Plant Hormones, are the fact they function as a signalling molecule, undergo binding, signal transduction to trigger a cellular response. Anything more, will be provided in a question.

As for Photoperiodism, nope.

I believe that the specific number of each different input and output is not required. However, you are most likely required to know the net output of ATP for each stage of cellular respiration and anaeorobic respiration.
« Last Edit: October 15, 2014, 11:07:49 pm by Tyleralp1 »
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shivaji

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Re: VCE Biology Question Thread
« Reply #3447 on: October 15, 2014, 11:37:33 pm »
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for a function of rna polymerase, could you say that it unwinds the dna double helix during transription?

vox nihili

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Re: VCE Biology Question Thread
« Reply #3448 on: October 16, 2014, 12:35:30 am »
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for a function of rna polymerase, could you say that it unwinds the dna double helix during transription?

No, it doesn't
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thushan

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Re: VCE Biology Question Thread
« Reply #3449 on: October 16, 2014, 07:17:45 am »
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for a function of rna polymerase, could you say that it unwinds the dna double helix during transription?

That's DNA helicase :) and is involved in DNA replication, not transcription.

RNA polymerase synthesises a new mRNA strand from a DNA template.
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