BiomoleculeshardMCQ SINGLE

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

Question

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

Answer: C

💡 Solution & Explanation

The isoelectric point ($pI$) 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 ($-COO^-$) and a fully protonated amino group ($-NH_3^+$).

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