Classify each amino acid according to whether its side chain is predominantly protonated or deprotonated at a pH of 7.40. values of amino acid side chains Asp His Lys 3.65 6.00 10.53 РКа Protonated Deprotonated His Asp Lys Answer Banke Now classify each amino acid according to the electrical charge of its side chain at a pH of 7.40. 2 It may help to review the structures of these three amino acids before answering this question. Positive Negative Neutral His Asp Lys