Biochemistry

[Tanpopo]

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?

[JackBean]

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