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MCAT Question A Day - 5/3/14 - Answer!

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 intermembrane space and the mitochondrial matrix.
D.  pumps protons through ATP synthase.

C is correct. The electrons from NADH drive protons outward across the inner mitochondrial membrane

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