All amino acids have an amino group and a carboxyl group. a chloro group. a bromo group. a benzyl group.

Answer : The correct option is, (A) carboxylic acid.

Explanation :

Amino acid : It is an acid which contains two functional groups which are carboxylic group, and ammino group, .

When the several amino acids join together with the help of peptide bond, they produce polypeptide chain or protein.

The bond present between the two amino acid is that peptide bond. The peptide bond is formed between the nitrogen of one amino acid and carbon of another amino acid.

Hence, the all amino acids have an amino group and carboxylic acid group.

The structure of amino acid is shown below.

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