The vitamin nicotinamide can be synthesized in our body from
(a) tyrosine
(b) tryptophan
(c) valine
(d) phenylalanine.
Correct option (b) tryptophan
Explanation:
The amino acid tryptophan serves as a source material for the synthesis of nicotinamide which in turn forms two coenzymes NAD and NADP with metabolic roles.