Figure 32.2: (A) A generalized structure of amino acid. (B) L and D-alinine

 

Amino acids are classified by R groups: As discussed, different amino acids are classified basd on the side chain or R group. All these 20 amino acids are denotaed by first letter (3 or single) or other letter (3 or single). The structure of these amino acids are given in Figure 32.3 and their different properties are given in Table 32.1. The Different amino acids are as follows:

NONPOLAR, Aliphatic R Group: The R group in this amino acids are non-polar and hydrophobic. Examples include are alanine, valine, leucine, isoleucine and glycine, methionine, proline.