What key enzymes, shared by transposon, retrotransposons, and retroviruses, can be used to demonstrate their shared evolutionary history?
A. reverse transcriptase
B. transposases
C. envelope proteins
D. integrases
E. reverse transcriptase, transposases, and integrases
E
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Each type of cone cell is stimulated by a different color of light. In humans, a colorful scene is perceived as a combination of signals from three cone types. Which colors correspond to these three cones?
I-Red II-Yellow III-Orange IV-Blue V-Green VI-Purple A. I, II, and III B. I, III, and IV C. I, IV, and V D. I, V, and VI E. II, IV, and VI
The Environmental Protection Agency
a. regulates the agricultural application of chemicals. b. has called for further study on the effects of atrazine on amphibians. c. now encourages farmers to minimize the runoff of atrazine-laden water from fields. d. does all of these. e. does none of these.
The opening of the uterus is referred to as the
A) endometrium. B) oviduct. C) cervix. D) fimbriae. E) clitoris.
A small group of mice were released on an island. The island previously had no mice on it, but had abundant food and no predators. After several years of growth, the size of the new island population stabilizes. However, at this point a hurricane drastically reduces the population. How would you describe the situation?
A. The new population size is a result of density-dependent regulation. B. The biotic potential of the population has been reduced. C. The island mouse population can now act as a source metapopulation. D. The new population size is a result of density-independent regulation. E. The island mouse population can now act as a sink metapopulation.