A population of mountain goats are split because of the formation of a glacier. After 50 years the glacier melts and the population reunites. Hybrid zones may occur if
A. both pre-mating and post-mating isolating mechanisms occur.
B. reproductive isolation is incomplete.
C. a geographic barrier is removed after reproductive isolation is complete.
D. both pre-mating and post-mating isolating mechanism occur and reproductive isolation is complete.
E. both pre-mating and post-mating isolating mechanisms occur and a geographic barrier is removed after reproductive isolation is complete are correct.
B. reproductive isolation is incomplete.
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Directional selection is demonstrated in
a. the color of peppered moths in England. b. the development of resistance to insecticides. c. the development of resistance to antibiotics. d. the coat color of rock pocket mice in Arizona. e. all of these.
What initiates the extrinsic clotting mechanism?
a. activation of thrombin b. release of substances outside of the blood c. aspirin d. conversion fibrinogen to fibrin e. activation of factor X
Bacterial cell walls are primarily composed of which of the following?
A) phospholipid protein B) protein C) carbohydrate D) peptidoglycan
Endospores represent a challenge to the fields of industrial and medical microbiology because ________.
A. they are resistant to harsh environments, thus allowing survival of endospore-forming organisms under conditions in which non-endospore-forming cells would not survive B. endospores are resistant to harsh environments, thus allowing survival of endospore-forming organisms under conditions in which non-endospore-forming cells would not survive, and endospore-forming organisms are often dangerous pathogens C. endospores are significantly smaller than vegetative cells D. endospore-forming organisms are often dangerous pathogens