What coenzyme derived from vitamin B3 (niacin) functions as an electron carrier in cellular catabolic oxidation reactions?
Answer and explanation
Correct answer: D. Nicotinamide adenine dinucleotide
NAD+ is synthesized from niacin (vitamin B3). It acts as a hydride ion (H-) acceptor in catabolic oxidations (such as glycolysis, pyruvate dehydrogenase, and TCA cycle), being reduced to NADH + H+.
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