At the isoelectric point,in which form does a | vedclass

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(D) The isoelectric point $(pI)$ is the $pH$ at which an amino acid carries no net electrical charge.At this $pH$,the amino acid exists as a dipolar i

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$H_3N^{+} - CHR - COO^{-}$

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(D) The isoelectric point $(pI)$ is the $pH$ at which an amino acid carries no net electrical charge.At this $pH$,the amino acid exists as a dipolar ion,commonly known as a zwitterion.In a zwitterion,the carboxyl group loses a proton to become a carboxylate ion $(COO^{-})$ and the amino group gains a proton to become an ammonium ion $(NH_3^{+})$.Therefore,the structure is $H_3N^{+} - CHR - COO^{-}$.

At the isoelectric point,in which form does an amino acid exist?

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