All the following amino acids contain a hydroxyl group, Except ?: (A) Serine, (B) Lysine, (C) Threonine, (D) Tyrosine
Answer is B. Amino acids with side chains containing Hydroxyl groups: 1.Serine 2.Threonine 3.Tyrosine Lysine is an amino acid with the side chain containing Basic groups Reference: Explanation: Harper's Biochemistry; 30th edition; Chapter 3; Amino acids and Peptides