of 25 > © Macmillan Learning Match each structure and description to the appropriate amino acid. لا Glycine Resources Solution Penalized Hint Submit Answ Histidine Isoleucine Answer Bank H NH₁* H-C=C C-C-COO R group partially protonated at physiological pH one chiral center smallest R group N NH H H CII H NH₁₂+ H-C-COO two chiral centers no chiral centers E CH HHH NH¸* H-C-C-C-C-COO | | HH CH, H X Attemp zoom