<prompt> Acidic propey to a-carbon of amino acid is due toCarboxyl groupAmino groupHydrogen atomNone  <response>: Ans. is a i.e., Carboxyl groupThe acid base propeies of amino acids depend on the amino and carboxyl groups attached to the a-carbon.The carboxyl -COOH group of an amino acid can donate protein H and behave as an acid forming a negatively charged anion C00-.Amino group -NH can accept proton H and behave as a base, forming positively charged cation NH3. 