Which of the following could NOT cause a gene frequency change?
A. migration into or out of a population
B. random mating
C. mutation
D. widespread epidemic disease causing the death of 90% of the organisms
B. random mating
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Which one of the following statements about the human impact on Earth's ecology is correct?
A. Agriculture has increased abundance and distribution of some species, while decreasing abundance and distribution of other species. B. Humans commandeer as much as 25% of all photosynthetic production on land. C. More atmospheric nitrogen is converted to ammonia by humans than by the rest of nature. D. Human activities produce more carbon dioxide than do volcanoes. E. All of these statements about the human impact on Earth's ecology are correct.
You do an experiment in which you increase the concentration of phosphate in a solution and measure the uptake by plant cells. You find that once the concentration of phosphate reaches 1 gram per liter adding more phosphate does not increase uptake any further. From this you would conclude that phosphate is taken up by ________.
A. endocytosis. B. osmosis. C. exocytosis. D. facilitated diffusion. E. active transport.
The basal body is comprised of which structural component(s) of flagella?
a. Rod b. Filament c. Rod and Rings d. Rings e. Rod and Hook f. Hook
What was the purpose of Stanley Miller's experiment?
What will be an ideal response?