The amino acid that can be converted into a vitamin:
Glycine
Tryptophan
Phenylalanine
Lysine
Ans. B. TryptophanTryptophan can be converted to Niacin.The rate limiting enzyme in Niacin synthesis is Quinolinate Phosphoribosyl Transferase (QPRTase)Specialised products of TryptophanSerotonin (5 Hydroxytryptamine)MelatoninNiacin
Proteins and Amino Acids