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".
