A hypothetical amino acid has an amino group in its side chain. Which of the following is NOT one of its properties? Basic Polar Charged Nonpolar

Answer: Nonpolar

Explanation:

Examples of amino acids with at least an amino group side chain are arginine, lysine.

The amino group has a chemical formula of NH3+, hence it is positively charged, polar (since it bonds with negatively charged ions), and basic (since it accepts a proton, H+). Also, since the property of being "Nonpolar" requires a uncharged and hydrophobic (non-water soluble) side chain, it is not a property of amino group.

Thus, the amino group confers the properties of being Basic, Polar, and Charged to the amino acid except from being "Nonpolar".