Why areamino acids said to function as zwitterion?
Dear student
A zwitterion is a compound which contains both positively and negatively charged groups in the same molecule.
For example, amino acids
H2N-R-COOH
form zwitterions: the proton leaves the carboxylic acid group and the amine group becomes protonated, resulting in
+H3N-R-COO-
Thus, Amino acids have both basic group which is Amine group and Acidic group which is carboxylic grp . At isoelectric point it form NH4+ And form zwitter ion.
Regards