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

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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