Question

which of the following statements about nad+ is true?
o nad+is the source of electrons used in oxidative phosphorylation.
o nad+has more chemical energy than nadh.
o nad+is oxidized by the action of dehydrogenase enzymes.
o nad+is reduced to nadh during glycolysis.

Explanation:

• In glycolysis, \(NAD^{+}\) acts as an electron carrier. It accepts electrons (gets reduced) to form \(NADH\).
• The source of electrons in oxidative phosphorylation is \(NADH\) (not \(NAD^{+}\)).
• \(NADH\) has more chemical energy than \(NAD^{+}\) because of the electrons it carries.
• Dehydrogenase enzymes reduce \(NAD^{+}\) (add electrons to it) rather than oxidize it.

Answer:

NAD+ is reduced to NADH during glycolysis.