CHAPER 24 AMIINO ACIDS AND PROTEINS 24.1 INTRODUCTION Of the three groups of biopolymers, protein have the most diverse function. Most of its molecular weights are much larger. Their shaps cover a range from the globular protein to the helical coils of a a-keratin. But all proteins have common features Proteins are polyamides and their monomeric units are about 20 different a-amino acidsCHAPER 24 AMINO ACIDS AND PROTEINS 24.1 INTRODUCTION Of the three groups of biopolymers, protein have the most diverse function. Most of its molecular weights are much larger. Their shaps cover a range from the globular protein to the helical coils of a α–keratin. But all proteins have common features. Proteins are polyamides and their monomeric units are about 20 different α-amino acids