Which statement BEST describes why niacin is required in the mammalian diet? A)

Question

Which statement BEST describes why niacin is required in the mammalian diet? A) Niacin is a precursor of nicotinamide adenine dinucleotide (NAD), which is a coenzyme required by many oxidoreductase enzymes. B) Niacin is a precursor of flavin adenine dinucleotide (FAD), which is a coenzyme required by many ligases. C) Niacin is a precursor of thiamine pyrophosphate, which is a coenzyme required by many transferases. D) Niacin is a component of coenzyme A, which is involved in many transferase reactions. E) Niacin is not actually required in the mammalian diet.

Explanation / Answer

45) A.Niacin is a precursor of nicotinamide adenine dinucleotide (NAD), which is a coenzyme required by many oxidoreductase enzymes.Niacin and its derivative nicotinamide are dietary precursors of nicotinamide adenine dinucleotide (NAD), which can be phosphorylated (NADP) and reduced (NADH and NADPH). NAD functions in redox reactions and non-redox reactions.

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