, gene swapping between two species is
A. impossible, but it happened frequently in the distant past.
B. infrequent but possible; it happened more often in the distant past.
C. much more frequent compared to in the distant past.
D. only possible if they are in the same family of organisms, such as lions and tigers.
B. infrequent but possible; it happened more often in the distant past.
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What becomes of the polar bodies formed during oogenesis?
A. They degenerate. B. They fertilize the egg. C. They become the follicle cells that surround the egg. D. They differentiate into sperm. E. They form the zona pellucida.
What type of thinking is required?
What will be an ideal response?
Cholera is spread by contaminated food and water. The bacterium kills by changing the permeability of the cells of the large intestine. Which therapy would give the best chance of saving a person with cholera, given the information in this chapter?
A) chemotherapy B) radiation C) fluid replacement D) surgery
During the Silurian, the oxygen gas concentration in the atmosphere is postulated to have reached an amount equivalent to more than 10 percent of its present-day concentration. Thus, nearly all lethal ultraviolet radiation was unable to reach the Earth's
surface, making dry land available for newly evolved forms. Which of the following major events in the evolution of animals and plants probably occurred at this time? A) The amphibians developed watertight skins and eggs. B) Primitive bryophytes and fern-like plants appeared. C) The first major groups of seed plants appeared. D) The crayfish become the first land organisms.