A deficiency of growth hormone during childhood results in ____
a. gigantism
b. pituitary dwarfism
c. osteoporosis
d. osteomalacia
e. acromegaly
ANSWER: b
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A phospholipid molecule has a polar and a nonpolar end. Because of this, water molecules form
A. polar bonds with the nonpolar end of the phospholipid molecule. B. polar bonds with the polar end of the phospholipid molecule. C. hydrogen bonds with the nonpolar end of the phospholipid molecule. D. hydrogen bonds with the polar end of the phospholipid molecule. E. covalent bonds with the nonpolar end of the phospholipid molecule.
The gradient distributions of alleles across continents reflect _____
a. the delineation of new races b. genetic drift c. human migration patterns d. protective alleles e. natural selection
A ____ mutation changes the DNA sequence but has no impact on the fitness of the individual
a. beneficial b. lethal c. random d. neutral e. deleterious
Host specificity of a virus is due to
A) particular genes that it shares with the infected cell. B) the presence of an envelope. C) differences in size between the virus and the host cell. D) the presence or absence of a cell wall on the host cell. E) interactions between viral and cellular surface molecules.