At its exact isoelectric point (), an amino acid predominantly exists in an aqueous solution as a(n):

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At its exact isoelectric point ($pI$), an amino acid predominantly exists in an aqueous solution as a(n):

Prashant Kotian · Accepted Answer

Correct answer: C. The isoelectric point () is the specific pH at which an amino acid exhibits a net electrical charge of zero. Here, it predominantly assumes a dipolar "Zwitterion" structure, featuring a fully deprotonated carboxyl group () and a fully protonated amino group ().

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