What gives each amino acid its unique properties?

a.) its side group
b.) its amino group
c.) its carboxyl group
d.) its sequence

All amino acids have the same structure but vary in side groups. The main structure is composed on an amine and a carboxyl group. Keeping this in mind we can say that options B (its amino group) and option C (its carboxyl group) are not the correct answer. What they all differ in is its side group or side chain. Which also is what gives an amino acid its unique properties.

Oh dog