The most abundant lipid of the membrane consists of a head and two tails. This type of lipid is
A. a phospholipid.
B. cholesterol.
C. glycolipid.
D. glycoprotein.
E. a steroid.
A
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Which of the following is not true of arteries?
a. They carry blood away from the capillaries. b. They carry blood away from the heart. c. They have thicker tunica media than do veins. d. Their innermost layer is composed of endothelium.
What is the earliest sign of puberty in girls?
A) The first menstrual period B) The appearance of pubic and axillary hair C) The onset of breast development D) The increase in muscle mass E) The appearance of sebaceous and axillary glands
Too much carbon dioxide in the blood can be the result of _______
A) fever B) emphysema C) hyperventilation D) anxiety
Cytokines have a _____ half-life and exert influence on ________________
A. long; immune cells only. B. long; immune and non-immune cells. C. short; immune cells only. D. short; immune and non-immune cells.