Guanidine special group is presesnt in: (A) Arginine, (B) Proline, (C) Tryptophan, (D) Tyrosine
Answer is A. AMINO ACID SPECIAL GROUP Arginine Guanidinium Proline Pyrolidine Tryptophan Indole Phenylalanine Benzene Tyrosine Phenol Histidine Imidazole Methionine Thioether linkage Reference: Harpers illustrated biochemistry 30th edition