Aerobic respiration

[Ruminate]

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EK Gen Bio Lect. 1
20. In aerobic respiration, the energy from the oxidation of NADH:
A. directly synthesizes ATP.
B. passively diffuses protons from the intermembrane space into the matrix.
C. establishes a proton gradient between the intermem-brane space and the mitochondrial matrix.
D. pumps protons through ATP synthase.

Answer:C







I got this right just because I've had this type of question from class. But how can I correct D? The proton gradient formed from the energy of NADH oxidation pumps protons through ATP synthase? And for B, is it not passive?

 

[chrisharimlee]

EK Gen Bio Lect. 1
20. In aerobic respiration, the energy from the oxidation of NADH:
A. directly synthesizes ATP.
B. passively diffuses protons from the intermembrane space into the matrix.
C. establishes a proton gradient between the intermem-brane space and the mitochondrial matrix.
D. pumps protons through ATP synthase.

Answer:C







I got this right just because I've had this type of question from class. But how can I correct D? The proton gradient formed from the energy of NADH oxidation pumps protons through ATP synthase? And for B, is it not passive?

I think the way you corrected D is accurate, however i believe B is not passive. My understanding of this is that the energy from the oxidation of NADH will cause a protons to be pumped out into a more H+ concentrated inter-membrane space. There are more protons in the IM space bc there needs to be a proton gradient so that they can come back into the matrix by way of facillitated difussion through the ATP sythase, which will cause ATP to be made by the synthase. I think the main point is passive transport is for transporting things from a higher to a lower concentration, and since this is not the case it must be active