Which of the following is not true of gene regulation by DNA looping?
A. The precise distance between the regulatory sequence and the promoter is important.
B. It can result in gene repression.
C. It can result in gene activation.
D. It can result in the regulation of a gene even thousands of base pairs away from the regulatory site.
A
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The change in population size is measured in terms
of a. birth rates. b. death rates. c. the number of individuals entering the population. d. the number of individuals leaving the population. e. all of these.
The greater the number of links in a food chain, the higher the
A) species diversity. B) number of top predators. C) connectance. D) mean chain length.
A lamprey is a(n)
A) jawless fish. B) bony fish. C) invertebrate chordate. D) amphibian. E) cartilaginous fish.
Human skin color likely represents a locally adapted compromise between
A) the need to block UV radiation that causes cancer and the need to absorb sunlight for heat. B) the need to block UV radiation that destroys folate and the need to synthesize vitamin D. C) the need to block UV radiation that destroys folate and the need to absorb sunlight for heat. D) the need to blend in with the environment and the need to absorb sunlight for heat.