LIFE SCIENCE

Detailed explanation-1: -There are basically 20 standard amino acids having different structures in their side chains(R groups) . The common amino acids are known as a-amino acids because they have a primary amino group(-NH2) and a carboxylic acid group(-COOH) as substitutes of the a carbon atoms.

Detailed explanation-2: -The carbon, carboxyl, and amino groups are common to all amino acids, so the R-group is the only unique feature in each amino acid.

Detailed explanation-3: -Amino acids differ from each other with respect to their side chains, which are referred to as R groups. The R group for each of the amino acids will differ in structure, electrical charge, and polarity.

Detailed explanation-4: -This R group, or side chain, gives each amino acid proteins specific characteristics, including size, polarity, and pH. Figure: Amino acid structure: Amino acids have a central asymmetric carbon to which an amino group, a carboxyl group, a hydrogen atom, and a side chain (R group) are attached.