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1. the carboxylic acid group which contains carbon and oxygen

2. the amino group, which contains nitrogen and hydrogen

3. the r group which varies with each amino acid

Amino acid contains three parts, namely, amine group, carboxyl group, and a side chain.

What is amino acid?

Amino acids are compounds that form proteins when they combine. The basic blocks or one can say, building blocks of life are amino acids and proteins.

Amino acids usually contain amino (−NH+3) and carboxylic acid ( −COOH) functional groups, and a side chain (R group).

Thus, the three parts of an amino acid are amino group, carboxyl group, and a side chain.

For more details regarding amino acid, visit:

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