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Question

Chemistry Question on Biomolecules

In aqueous solution, an amino acid exists as

A

cation

B

anion

C

dianion

D

zwitter ion

Answer

zwitter ion

Explanation

Solution

In aqueous solution, an amino acid exists as a dipolar ion, which is known as Zwitter ion.
R−CHN∣H2−COOH<=>R−CHN+∣H3−COO−Zwitter ionR - \overset{\underset{|}{N}H_2}{CH} - COOH {<=>} \underset{\text{Zwitter ion}}{R - \overset{\underset{|}{\overset{+}{N}}H_3}{CH} - COO^-}