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Biochemistry

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Biochemistry

Postby Tanpopo » Sun Nov 07, 2010 6:08 am

I have two true and false questions:

1) Electron from the reductant of a redox couple can transfer exergonically to the oxidized member of another couple that has a more positive standard reduction potential.

What I think:
At first I thought it is true, because from the equation: delta E = E(acceptor) - E(donar), you will get a positive value. But then... how can you transfer electron from one reductant to another reductant? Maybe I misunderstand the statement?

2) Because of the glycolytic pathway is located in the cytosol of eukaryotic cells, it functions independenly of the citric acid cycle under aerobic conditions.

What I think:
False. Pyruvate is produced in glycolysis. Under aerobic condition, pyruvate is oxidzied to acetyl-CoA and will go thorugh citric acid cycle, which occur in mitochondria. Therefore, glycolytic pathway doesn't function independenly of the citric acid cycle under aerobic condition.
Am I right? Did I explain enough?
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Postby JackBean » Tue Nov 09, 2010 6:45 pm

1) why one reductant to other reductant? Imagine H2 + Na+ -> hydrogen is reductant, rigth? Na+ is in oxidised form, rigth?

2) I don't think it's kind of connected with the TCA cycle, because NADH2 is re-oxidized in the electron transport chain
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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