Identify the correct statements. A. Arginine and Tryptophan are essential amino acids. B. Histidine does not contain heterocyclic ring in its structure. C. Proline is a six membered cyclic ring amino acid. D. Glycine does not have chiral centre. E. Cysteine has characteristic feature of side chain as MeS - CH ₂- CH ₂- . Choose the correct answer from the options given below :

Step-by-step solution

A. Arginine and Tryptophan are essential amino acids - True B. Histidine contains imidazole ring (heterocyclic ring with N) - Statement is False C. Proline has a 5-membered pyrrolidine ring, not 6-membered - False D. Glycine ( NH₂-CH₂-COOH ) has no chiral center (α-carbon has two H atoms) - True E. Cysteine side chain is -CH₂-SH (thiol). MeS-CH₂-CH₂- is the side chain of Methionine, not Cysteine - False Correct statements: A and D only