All are essential amino acid except: (A) Phenylalanine, (B) Lysine, (C) Leucine, (D) Glycine
Answer is D. The essential amino acids are Isoleucine, Leucine Threonine Lysine, Methionine, Phenylalanine, Tryptophan, and Valine.Ref: DM Vasudevan - Textbook of Biochemistry for Medical Students, 7th edition, page no: 27