ObjectiveMcq
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What is the nature of charges that amino acid side chains carry?
Correct Answer: D — A and B
When an amino acid is incorporated into a polypeptide, the charges on the amino and carboxyl groups disappear. Among the 20 common amino acids, five have a side chain which can be charged. At pH=7, two are negative charged: aspartic acid and glutamic acid (acidic side chains), and three are positive charged: lysine, arginine and histidine.