Figure 212

(a) Steroid ring structure, shown with all the carbon and hydrogen atoms in the rings and again without these atoms to emphasize the overall ring structure of this class of lipids. (b) Different steroids have different types and numbers of chemical groups attached at various locations on the steroid ring, as shown by the structure of cholesterol.

Vander et al.: Human Physiology: The Mechanism of Body Function, Eighth Edition

PART ONE Basic Cell Functions

Charge on side chain

Side chain

Amino acid

NH2 Amino group

Nonpolar

CH CH2 CH3

CH CH

CH C CH2

CH CH

C COOH I

C COOH I

C COOH I

Alanine

Leucine

Phenylalanine

CH2 CH2 CH2-

C COOH I

Proline

Polar

(+)

(-)

1

H

O CH2

—C-COOH

Serine

NH2

(+)

(-)

1

C COOH I

Cysteine

H S CH2

C COOH I

Cysteine

O C CH2 CH2

Ionized

C COOH I

C COOH I

Glutamate

Lysine

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