When a population goes through a bottleneck, ____
a. genetic drift is likely to occur
b. mutation rates increase
c. extinction rates decrease
d. natural selection decreases in intensity
e. inbreeding decreases
ANSWER: a
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The antibiotics streptomycin and erythromycin work by inhibiting the function of ____ in bacteria but not eukaryotes
a. RNA polymerases b. aminoacyl-tRNA synthetases c. spliceosomes d. DNA polymerases e. ribosomes
Researchers hypothesize that the hybrid zone of Bullock’s orioles and Baltimore orioles remains narrow because
hybrids ____.
a. are routinely eliminated by natural selection within the hybrid zone b. prefer the moist habitats of the Baltimore oriole c. prefer hotter and drier habitats of the Bullock’s oriole d. are well adapted to both the dry habitats of the Bullock’s oriole and to the moist habitats of the Baltimore oriole e. are not well adapted to the dry habitats of the Bullock’s oriole or to the moist habitats of the Baltimore oriole
The Panama Canal was completed in 1914, and its depth is about fifty feet. After 1914, snapping shrimp species from which habitats should be most likely to form hybrids as the result of the canal?
A) A5 and B5 B) A3 and B3 C) A1 and B1 D) A1-A3 and B1-B3 have equal likelihoods of harboring snapping shrimp species that can hybridize.
The movement of molecules with/down a concentration gradient through transport proteins in the cell membrane is a type of
A.) selective transport. B.) osmosis. C.) energy expenditure. D.) facilitated diffusion.