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In strongly acidic solution below pH 3, a typical amino acid carries what structure?
ANH2-CHR-COO-
BNH3+-CHR-COO-
CNH3+-CHR-COOH
DNH2-CHR-COOH
Answer & Solution
Correct answer: C. NH3+-CHR-COOH
Excess acid protonates the carboxylate, leaving the ammonium group and a neutral COOH, so the molecule is a cation.
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