Question

is a molecule containing an amine group, a carboxylic acid group, and a side chain that is specific to each type of amino acid
amino acid
protein

Explanation:

An amino acid has an amine group ($-NH_2$), a carboxylic acid group ($-COOH$), and a side - chain (R group). Proteins are polymers made up of amino acids linked by peptide bonds.

Answer:

Amino Acid