Cysteine is formed from: (A) Methionine and serine, (B) Methionine and glycine, (C) Alanine and glycine, (D) Serine and glycine
Answer is A. Serin+Homocystein ------->Cysteine+Homoserin.Homocystein is synthesized from Methionine.Ref: DM Vasudevan - Textbook of Biochemistry, 7th edition, page no: 217, Fig no 16.15