Which of the following statements about NAD+ is true?
a. NADhas more chemical energy than NADH.
b. NADis reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle
c. NADis oxidized by the action of hydrogenases.
d. NADcan donate electrons for use in oxidative phosphorylation.
The correct answer is (b) NAD is reduced to NADH during glycolysis, pyruvate oxidation, and the citric acid cycle
NADH is an electron carrier used in the process of cellular respiration. The oxidized form, NAD, receives electrons from glucose, forming NADH. NADH then carries these electrons to the electron transport chain, where they can be used to generate ATP.