In biological membranes, the phospholipids are arranged in a
A) single layer, with the fatty acids facing the interior of the cell.
B) bilayer, with the phosphorus groups in the interior of the membrane.
C) bilayer, with the fatty acids pointing toward one another.
D) single layer, with the phosphorus-containing region facing the interior of the cell.
E) bilayer, with the fatty acids facing outward (facing the interior and exterior of the cell).
C
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Farsightedness can be caused by:
a. a longer than normal eyeball b. a shorter than normal eyeball c. weak lens muscles d. a longer than normal eyeball and/or weak ciliary muscles e. a shorter than normal eyeball and/or weak ciliary muscles
Hutchinson-Gilford progeria syndrome (the aging
disease) a. is controlled by a simple recessive gene. b. is a sex-linked disease more common in males. c. occurs only in those individuals in which a mutation arises and is not found in other members of the family. d. is the result of the failure of chromosomes to separate so that an individual receives three instead of two chromosomes. e. is none of these.
Cilia lining the respiratory tubes beat mucus upward in order to:
a. moisten the bronchioles. b. conduct the mucus that contains particles to the pharynx and away from the lungs.
c. provide mucus to the lungs to prevent them from dehydrating. d. lubricate the throat for easier swallowing. e. promote gas exchange by providing mucus for the respiratory surfaces.
Where is an anther typically found in a flower?
a. at the tip of a filament b. at the tip of a carpel c. at the tip of an ovule d. at the tip of a calyx