Which of the following is the simplest amino acid?

Step-by-step solution

Amino acids are the monomers that make up proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, also known as the alpha ( ) carbon, bonded to an amino group ( NH ₂ ) , a carboxyl group ( COOH ) , and to a hydrogen atom. Glycine is the simplest of all amino acids as R-group is hydrogen.