Question
In the context of charged amino acids, a basic amino acid has an R group that contains which of the following functional groups that can accept a proton and become positively charged at physiological pH?
(A) A nonpolar hydrocarbon group composed only of carbon and hydrogen.
(B) An amino (nitrogen-containing) group, such as an amine, guanidinium, or imidazole, that can be protonated.
(C) A carboxyl group that donates a proton and becomes negatively charged.
(D) A hydroxyl group that remains uncharged at physiological pH.
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Evidence boundary
This page answers the Pearson classification question. Basic refers here to a side chain's ability to accept a proton; lysine, arginine, and histidine do not contain the same functional group or have identical protonation behavior. Histidine's protonation state is especially sensitive to local environment.