Identify the functional group / groups found in amino acid.

Amino acids are organic molecules that serve as the building blocks of proteins.

The general structure of an alpha-amino acid consists of a central carbon atom (the alpha carbon) bonded to an amino group ($\text{-NH}_2$), a carboxyl group ($\text{-COOH}$), a hydrogen atom, and a variable side chain (R group).

Therefore, the functional groups characteristically found in all amino acids are the carboxyl group ($\text{COOH}$) and the amino group ($\text{NH}_2$).

Answer: COOH and $\text{NH}_2$