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Answer :
Amino acids can be classified according to whether their side chain is predominantly protonated or deprotonated at a pH of 7.40. The pKa values of the Asp, His, and Lys side chains are 3.65, 6.00, and 10.53, respectively.
Based on these values, the classification can be determined as follows: Amino acids whose side chains are predominantly protonated at pH 7.40:Aspartic acid (Asp) has a pKa of 3.65, which is lower than the pH of 7.40, so its side chain is predominantly protonated at pH 7.40. Amino acids whose side chains are predominantly deprotonated at pH 7.40:Histidine (His) has a pKa of 6.00, which is close to the pH of 7.40, so its side chain is likely to be half-protonated and half-deprotonated at pH 7.40. Lysine (Lys) has a pKa of 10.53, which is higher than the pH of 7.40, so its side chain is predominantly deprotonated at pH 7.40.
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