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