AP Biologyeasymcq1 pt
If a solution of a biomolecule turns a pH indicator acidic, which group is most likely present?
A.Carboxyl
B.Hydroxyl
C.Methyl
D.Sulfhydryl
Explanation
Core Concept
Carboxyl groups donate H⁺, lowering pH. Amino acids and fatty acids owe their acidity to –COOH.
Correct Answer
ACarboxyl
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