AP Biology· difficulty 2/5
Which functional group ionizes to release a proton, conferring acidic character?
Amino (-NH₂)
Methyl (-CH₃)
Carboxyl (-COOH)
Hydroxyl (-OH)
Explanation
-COOH → -COO⁻ + H⁺ readily, making it an acid; this is the basis of amino-acid carboxyl behavior.
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