The enzyme reverse transcriptase was discovered by
A. Arber and Smith.
B. Temin and Baltimore.
C. Jackson, Symons, and Berg.
D. Boyer and Cohen.
Answer: B
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Mammals and birds eat more often than reptiles. Which of the following traits shared by mammals and birds best explains this habit?
A) endothermy B) ectothermy C) insulating body cover D) amniotic egg E) terrestrial
Desulfuromonaceae and Geobacteraceae are strict anaerobic mesophilic bacteria and have been isolated from anoxic ________ environments.
What will be an ideal response?
The radioimmunoassay test is used frequently for
A. identification of viruses. B. separation of DNA fragments. C. identification of bacteria. D. determining levels of hormones.
When mosquitoes are abundant, purple martins flock to the area and feed exclusively on them. When mosquito populations are not large, purple martins are similarly scarce and feed on other insects. This is an example of
A) density-dependent regulation. B) exotic regulation. C) ecosystem carrying capacity. D) density-independent regulation. E) community carrying capacity.