Figure 213
Structures of 8 of the 20 amino acids found in proteins. Note that proline does not have a free amino group, but it can still form a peptide bond.
Polypeptides Amino acids are joined together by water is formed (Figure 2-14). The bond formed be-linking the carboxyl group of one amino acid to the tween the amino and carboxyl group is called a pep-amino group of another. In the process, a molecule of tide bond, and it is a polar covalent bond.
Vander et al.: Human I I. Basic Cell Functions I 2. Chemical Composition of I I © The McGraw-Hill
Physiology: The the Body Companies, 2001
Mechanism of Body Function, Eighth Edition
Chemical Composition of the Body CHAPTER TWO
R2 O
Amino group Carboxyl (acid) group
Amino acid 1
Amino group Carboxyl (acid) group
Amino acid 2
Peptide bond NH
C CH
il I
O R2
— Additional amino acids
NH2-CH-C-OH
nh2-ch-c-oh
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