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HSC Biology Question Thread

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kauac:

--- Quote from: Chocolatepistachio on June 05, 2020, 08:54:45 pm ---Pls can someone help me with this question

--- End quote ---

Hi!

This is a tricky question! I'm not entirely sure why the answer is c, but maybe it's something to do with CO2 being the only option that is a by-product of aerobic respiration - whereas the others are helpful metabolites!

Hopefully someone else may have a better idea of why it's C.  :)

Einstein_Reborn_97:

--- Quote from: Chocolatepistachio on June 04, 2020, 05:37:16 pm ---Hello for this multiple choice question is the answer c?

Some living cells were maintained in a culture medium under aerobic conditions. They were supplied with glucose labelled with radioactive carbon-14? Which of the following is likely to be true

A carbon14 atoms would be found in NADH
B carbon 14 atoms would be found in atp

C carbon 14 atoms would be found in carbon dioxide produced by the cells
D Carbon 14 atoms would be found in pyruvate

Thanks

--- End quote ---
Yeah I'm pretty sure it's C. The question states "aerobic conditions" so that implies that aerobic cellular respiration was being observed. In cellular respiration, the reactants are glucose (which was supplied with radioactive carbon-14) and oxygen, whilst the products are carbon dioxide and water. The logical aim of this experiment would be to trace the movement of the glucose molecules and the logical conclusion would be that the carbon-14 isotope ends up in the carbon dioxide product. Therefore, the answer should be C.

Chocolatepistachio:
Ok thanks!

Also for this question
From which of the following is the waste product urea formed
A sugars
B fats
C protein
D Glycerol

Is the answer c??

Einstein_Reborn_97:

--- Quote from: Chocolatepistachio on June 05, 2020, 10:31:23 pm ---Ok thanks!

Also for this question
From which of the following is the waste product urea formed
A sugars
B fats
C protein
D Glycerol

Is the answer c??

--- End quote ---
Yes. The liver breaks down excess amino acids (which make up protein) to make ammonia, then converts this into urea.

Chocolatepistachio:
For this question:

Atp synthase produces atp.....

A during the electron transport chain in the krebs cycle of cellular respiration
B only during glycolysis in cellular respiration
C in cellular respiration and the light dependent reactions of photosynthesis
D directly from the photolysis of water

Would it be a??

Thank you for your help!

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