An -NH₂ Group and a -COOH Group are Most Characteristic

Question

An -NH₂ group and a -COOH group are most characteristic of a(n)
A) fatty acid.
B) amino acid.
C) monosaccharide.
D) ketoacid.

Accepted Answer

The presence of both an -NH₂ group and a -COOH group is most characteristic of an amino acid, which is the building block of proteins. Fatty acids have a carboxyl group (-COOH) but not an amino group (-NH₂), while monosaccharides and ketoacids do not typically have either of these functional groups.