The chemical character of an amino acid (charged, polar, hydrophobic, etc.) is determined by its
- Acheck_circle
R-group (side chain)
- B
Carboxyl group (COOH)
- C
Central α-carbon
- D
Amino group (NH2)
Explanation
The amino, carboxyl, and α-C are the same in every amino acid; the R-group is what varies and gives each its unique properties.