Selenocysteine is synthesized from: (A) Alamine, (B) Cysteine, (C) Arginine, (D) Histidine
Answer is B. Selenocysteine is the 21st amino acid. Biosynthesis of Selenocysteine is by replacing the oxygen by selenium in Serine which in turn formed from Cysteine.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 214