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


il I

O R2

— Additional amino acids



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