Which three components are common to all amino acids?
an amino group, a carboxyl group, and an r group
an amino group, a phosphate group, and an r group
a five-carbon sugar, a phosphate group, and a nitrogenous base
a five-carbon sugar, an amino group, and a nitrogenous base

Answer: An amino group, a carboxyl group, and an R group.

Explanation:

Amino acids are organic compounds that contain two functional groups - one is the amino group and the other is a carboxyl group.Besides the 2 functional groups, the amino acids also have a side chain which is donated as R.The functional groups and the side chain are usually connected to a central carbon atom.The basic structure of an amino acid is also shown in the attached image.