Selenocysteine is derivative of which amino acid?: (A) Cysteine, (B) Alanine, (C) Arginine, (D) Glycine
Answer is A. Selenocysteine is the 21st amino acid.its biosynthesis is by replacing oxygen from serine by selenium.cysteine is formed from serine (reversible). hence selenocysteine is formed from cysteineRef: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 215