AP Biologyeasymcq1 pt
Which functional group makes a molecule behave as an acid in water?
A.Carboxyl (–COOH)
B.Hydroxyl (–OH)
C.Methyl (–CH₃)
D.Carbonyl (C=O)
Explanation
Core Concept
The carboxyl group releases H⁺ in solution, giving amino acids and fatty acids their acidic behavior. It is the defining group of organic acids.
Correct Answer
ACarboxyl (–COOH)
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