A neutral amino acid has two dissociation constants: for the carboxyl group and for the amino group. The exact isoelectric point () of this amino acid is:

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Question

A neutral amino acid has two dissociation constants: $pK_{a1} = 2.3$ for the carboxyl group and $pK_{a2} = 9.7$ for the amino group. The exact isoelectric point ($pI$) of this amino acid is:

Prashant Kotian · Accepted Answer

Correct answer: A. For a neutral amino acid without an ionizable side chain, the isoelectric point () is the arithmetic mean of the two values. .

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