Which of the following statements describes NAD+?
A) NAD+ has more chemical energy than NADH.
B) NAD+ can donate electrons for use in oxidative phosphorylation.
C) NAD+ is oxidized by the action of hydrogenases.
D) NAD+ is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle.
E) In the absence of NAD+, glycolysis can still function.
Answer: D