BIOMOLECULES AND ENZYMES

Detailed explanation-1: -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-2: -R group: The R group is a side chain specific to each amino acid that confers particular chemical properties to that amino acid. polypeptide: Any polymer of (same or different) amino acids joined via peptide bonds.

Detailed explanation-3: -The amino acid backbone is identical on all amino acids, the R groups are different on all amino acids. For the structure of each amino acid refer to the figure below. There are 20 common amino acids found in proteins, each with a different R group (variant group) that determines its chemical nature.