VCE Biology Question Thread

[Angelx001]

Suggest two ways in which this antibody could work to counteract funnel web spider venom in humans. (2 marks)
- It can bind to antibodies as they have the same complementary shape, hence, the antibodies can cause agglutination & make it easier for macrophages to engulf & destroy.
- It can neutralise toxins produced by the invading pathogen (venom).

How many marks would I get for this?

[Angelx001]

Does independent assortment occur in metaphse 1 or anaphase 1 of meiosis?

Metaphase 1

[AhNeon]

- Transcription does not involve modification of pre-mRNA, as pre-mRNA modification is also known as post-transcriptional modification, the word transcription is simple referring to the formation of a pre-mRNA strand from a dna template

Then why is it that when VCAA ask for the product of transcription, mRNA is the answer and not pre-mRNA. If the modification of mRNA from pre-mRNA is post-transcriptional, shouldnt the answer be 'pre-mRNA'
Thanks for the help!

[Gogo14]

I just can't get my head around this question

[vox nihili]

I just can't get my head around this question

One I wouldn't worry about.


It's basically because you remove the nodes and not the lymphatics. So the lymphatics will drain back into the tissue (rather than the node). You'd expect that to have some white blood cells, as white blood cells go from the tissue to the lymph nodes to go and chill out with the lymphocytes, for reasons you don't need to understand in VCE.

[tiff_tiff]

Hello,
I am revising through blood regulation (homeostasis)
I know that when you stand up for long periods of time, blood can pull at your feet increasing blood pressure due to gravity (hydrostatic pressure), and if i am to comment on the ways the body compensates for this, is there anything else besides from:
1. stretch sensed by baroreceptors/carotid arch to vasoconstrict and reduce the blood flowing to the feet
2. something about myogenic response
3. would muscle pump come into play to try and increase venous return to reduce the pressure, but that doesn't really work when you are standing up idle without moving
4. I'm guessing there would be a release of some hormones?

I feel like I'm missing something...

Please and thanks in advance!

[solution]

Hello,
I am revising through blood regulation (homeostasis)
I know that when you stand up for long periods of time, blood can pull at your feet increasing blood pressure due to gravity (hydrostatic pressure), and if i am to comment on the ways the body compensates for this, is there anything else besides from:
1. stretch sensed by baroreceptors/carotid arch to vasoconstrict and reduce the blood flowing to the feet
2. something about myogenic response
3. would muscle pump come into play to try and increase venous return to reduce the pressure, but that doesn't really work when you are standing up idle without moving
4. I'm guessing there would be a release of some hormones?

I feel like I'm missing something...

Please and thanks in advance!

Pretty sure everything you said is off the study design (unless this is the new 1/2)

[Angelx001]

When aerobic respiration occurs, does it use glucose from glycogen or glucose from the blood? I'm confused

[AhNeon]

Is it pyruvate or acetyle CoA that enters kerbs cycle. Like i know pyruvate release a carbon dioxide and forms acetyl, but does this happen in the krebs cycle or just before it

[FatimaEl]

Then why is it that when VCAA ask for the product of transcription, mRNA is the answer and not pre-mRNA. If the modification of mRNA from pre-mRNA is post-transcriptional, shouldnt the answer be 'pre-mRNA'
Thanks for the help!

one would presume it would be pre-mRNA, however i feel like they're more so asking what is produced in the nucleus to be transported out and be involved in translation, if that makes sense.
We might be thinking too much into it, VCAA says mRNA is formed during transcription (question 2 in exam 1 of the 2009 exams) so we should just stick with that

[FatimaEl]

Is it pyruvate or acetyle CoA that enters kerbs cycle. Like i know pyruvate release a carbon dioxide and forms acetyl, but does this happen in the krebs cycle or just before it

pyruvate enters the krebs cycle and there it transforms into acetyl CoA

[plsbegentle]

pyruvate enters the krebs cycle and there it transforms into acetyl CoA

well technically pyruvate enters the mitochondria, it transforms to acetyl CoA, then enters the kerb cycle.

[vox nihili]

When aerobic respiration occurs, does it use glucose from glycogen or glucose from the blood? I'm confused

[AhNeon]

Man Bio is killing me.
Does fermentation include glycolysis or do you count them as two different stages which occur one after each other. I always thought they were separate processes which were covered by 'anaerobic respiration' but a VCAA question pointed in the direction that the term fermentation is inclusive of glycolysis

[plsbegentle]

Man Bio is killing me.
Does fermentation include glycolysis or do you count them as two different stages which occur one after each other. I always thought they were separate processes which were covered by 'anaerobic respiration' but a VCAA question pointed in the direction that the term fermentation is inclusive of glycolysis

yeh fermentation includes glycolysis, you need the pyruvate to be converted into lactic acid in animals. Much like the conversion of pryvuate into acetyl coA, you include glycolysis in cellular respiration too.