Where are ectomycorrhizae MOST commonly found?
A) boreal and temperate forests
B) forests with especially low nutrients
C) tropical forests
D) boreal and temperate forests, forests with especially low nutrients, and tropical forests
Answer: A
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In which stages do internal checkpoints occur during the cell cycle?
a. Near the end of G1 and at the G2–M transition b. Only during metaphase c. Near the end of G1, at the G2–M transition, and during metaphase d. Only at the end of the G2–M transition
Which of the following factors is probably the most important in the success of the reintroduction of wolves in Yellowstone National Park?
A. The cooperation of local residents. B. The genetic diversity in the population. C. The availability of prey species. D. The hybridization of the species with coyotes. E. Both "The cooperation of local residents" and "The availability of prey species."
Refer to the paragraph on dark-eyed junco birds. The UCSD campus male junco population tails are about 36% white, whereas the tails of males from nearby mountain populations are about 40-45% white
The founding stock of UCSD birds was likely from the nearby mountain populations because some of those birds overwinter on the UCSD campus each year. Population sizes on the UCSD campus have been reasonably large, and there are significant habitat differences between the UCSD campus and the mountain coniferous forests; UCSD campus has a more open environment (making birds more visible) and a lower junco density (decreasing intraspecific competition) than that in the mountain forests. Given this information, which of the following evolutionary mechanisms do you think is most likely responsible for the difference between the UCSD and mountain populations? A) natural selection B) genetic drift C) gene flow D) mutation
The two major types of viruses are DNA and RNA viruses.
a. true b. false