VCE Biology Question Thread

[shan_19]

Can someone please describe an exam-type response of what happens in each stage of aerobic respiration?

[katiesaliba]

Can someone please describe an exam-type response of what happens in each stage of aerobic respiration?

Glycolysis- 1 glucose molecule is converted to 2 pyruvate. Net gain of 2 ATP and 2 NADH.
Krebs cycle- Each pyruvate molecule is reduced to carbon dioxide. 2 ATP, 6 NADH and 2 FADH2 are produced.
Electron transport chain- Loaded carriers NADH and FADH2 are oxidised, providing electrons to acceptor molecules within the mitochondrial cristae. H+ ions are also provided, adding to a concentration gradient of protons in the intermembrane space which fuels ATP synthase to produce 32-34 ATP. Oxygen is the last acceptor molecule (is reduced), combining with H+ ions and electrons to produce water.

Please note that there is a more concise answer in the assessment reports.

[shan_19]

Glycolysis- 1 glucose molecule is converted to 2 pyruvate. Net gain of 2 ATP and 2 NADH.
Krebs cycle- Each pyruvate molecule is reduced to carbon dioxide. 2 ATP, 6 NADH and 2 FADH2 are produced.
Electron transport chain- Loaded carriers NADH and FADH2 are oxidised, providing electrons to acceptor molecules within the mitochondrial cristae. H+ ions are also provided, adding to a concentration gradient of protons in the intermembrane space which fuels ATP synthase to produce 32-34 ATP. Oxygen is the last acceptor molecule (is reduced), combining with H+ ions and electrons to produce water.

Please note that there is a more concise answer in the assessment reports.

Thank! Do you know which assessment report it's in?

[katiesaliba]

Thank! Do you know which assessment report it's in?

Not sure sorry :\ The 2008 unit 3 exam covered ETC in aerobic respiration though

[shan_19]

Not sure sorry :\ The 2008 unit 3 exam covered ETC in aerobic respiration though

That's fine thanks for your help

[DJA]

Could someone explain why answer A is wrong for this question (2010 Bio Exam 1 Multiple Choice question

I thought that the Thymus is where the leucocytes for killing virus infected cells (i.e. cytotoxic T lymphocytes) mature - hence A is right?

B is the answer given by VCAA and I can see why its right as well - T helper cells would be deficient as well. Just what makes B MORE right??

thanks

[shan_19]

Difference between cytosol and cytoplasm?

[howlingwisdom]

Could someone explain why answer A is wrong for this question (2010 Bio Exam 1 Multiple Choice question

I thought that the Thymus is where the leucocytes for killing virus infected cells (i.e. cytotoxic T lymphocytes) mature - hence A is right?

B is the answer given by VCAA and I can see why its right as well - T helper cells would be deficient as well. Just what makes B MORE right??

thanks

Answer A suggests that all leucocytes would be destroyed, but the B-cells, which mature in the bone marrow and not thymus, would not be destroyed (and plasma-B cells, confusingly enough, can be involved in a viral attack as well as cytotoxic T-cells)

[Rishi97]

Difference between cytosol and cytoplasm?

cytosol is the jellylike substance within a cell
cytoplasm is the jelly like substance including the organelles. But excluding the nucleus

[Chang Feng]

Just wondering anyone have a actual copy of the bio exam script (writing on for the actual exam this Friday) or know where to find one? Want to get used to where everything is exactly and not become flustered straight away

[anat0my]

What is the selection pressure and significance for a reduction in the width of the nose for human evolution? Thanks!

[katiesaliba]

http://www.vcaa.vic.edu.au/Documents/exams/biology/2010biol1-w.pdf

For question 2b in this exam, why will the mice fed hard food pellets weigh more than those fed soft food pellets?

[vox nihili]

http://www.vcaa.vic.edu.au/Documents/exams/biology/2010biol1-w.pdf

For question 2b in this exam, why will the mice fed hard food pellets weigh more than those fed soft food pellets?

It doesn't matter. Has nothing to do with the question really.

[alondouek]

Just wondering anyone have a actual copy of the bio exam script (writing on for the actual exam this Friday) or know where to find one? Want to get used to where everything is exactly and not become flustered straight away

Not entirely sure what you're after, but past exams can be found here: http://www.vcaa.vic.edu.au/Pages/vce/studies/biology/exams.aspx#H2N1002C

The format for the coming exam will be comparable with past exams.

[melzwelz]

Why would variation in mtDNA be greater in African populations than other populations according to the out-of-African hypothesis?