In a cell membrane, the fatty acid tails
a. face toward the inner and outer surfaces of the cell membrane
b. face toward each other in the interior of the bilayer
c. always face toward the inside of the cell
d. always face toward the outside of the cell
b
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Flower parts are borne on the tip of a stalk referred to as the:a
calyx. b. corolla. c. filament. d. receptacle. e. stigma.
Arteries differ from veins in that
A. veins carry blood to the internal organs of the body. B. arteries have valves that veins do not have. C. veins have thinner walls than arteries. D. the pressure in veins is greater than that in arteries.
________________ have a polar head and two non-polar tails and combine with ______ to make cell membranes.
Fill in the blank(s) with the appropriate word(s).
Half of the body's magnesium is stored in the:
A) bones. B) kidneys. C) skeletal muscle. D) extracellular fluid.