In eukaryotes, the 3' poly-A tail is attached to
A. poly-A polymerase.
B. the template strand of DNA.
C. mRNA.
D. the ribosome.
E. tRNA.
Answer: C
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a. true b. false
Some kinds of shrimp obtain food by cleaning parasites from the surface of fish. This can be termed mutualism because
A. neither participating member is damaged. B. both members benefit from the relationship. C. the shrimp benefit and their hosts are not injured. D. the host fishes cannot survive without the shrimp.
Which of the following has been proposed as an explanation for the relationship between energy input and diversity (the energy-diversity hypothesis)?
A) A larger amount of energy in an ecosystem can be shared by a larger number of species. B) Greater energy input and the resulting higher biological productivity might also support larger population sizes. C) High energy input might accelerate rates of evolutionary change and thus increase the rate of species formation. D) all of the above
N-Ras, K-Ras, and H-Ras are best described as
a) Three unrelated oncogenes that each cause sarcomas b) Three different cancer-causing mutations found in the same ras gene c) Different activation states of the Ras protein d) Three closely related genes that likely evolved from a single ras gene