Question

Amino acids usually exist in the form of zwitter ions. This means that they consist of:

• A. the basic $N{H}_2$ group and acidic $COOH$ group
• B. the basic group and the acidic $CO{O}^{-}$ group
• C. basic group and acidic group
• D. no acidic or basic group as such

Answer 1

Answer: (A), (C)

The correct options are
A the basic $N{H}_2$ group and acidic $COOH$ group
C basic group and acidic group

A zwitter ion is a dipolar ion. It is also known as inner salt.
In the zwitter ion of amino acids, the carboxylic group will be in its $(-CO{O}^{-})$ ionized form, and the amino group will be in its $(-N{H}_3^{+})$ ionized form.