It is the variety of what that gives rise to the incredible variation of protein structure and function?
spastic acid side chains
clump acid side chains
organism acid side chains
amino acid side chains
Figure 15.2 Structures of the 20 amino acids found in proteins are shown. Each amino acid is composed of an amino group ( NH+ 3 ), a carboxyl group (COO ), and a side chain (blue). The side chain may be nonpolar, polar, or charged, as well as large or small. It is the variety of amino acid side chains that gives rise to the incredible variation of protein structure and function.