A disease will be ________ likely to circulate in a community with a high percentage of individuals who are immune to the disease.
A. less
B. more
Answer: A
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All Hfr strains integrate into the chromosome at
A) the same locus. B) several specific sites. C) the same locus most of the time, although there may be some variation. D) loci that cannot be accurately determined.
How do arbuscular mycorrhizae (AM) help plants obtain more nutrients from the soil?
A) Byproducts of AM metabolism serve as primary nutrient sources for the plants. B) The AM increase the total surface area to absorb more nutrients. C) The hyphae develop as specialized nodules that directly produce nutrients for the plant. D) Signaling molecules in the plant are passed to the AM to initiate electron flow, which is in turn used to create ATP.
Who won the Nobel Prize for the discovery of the structure of DNA?
a) Sir Isaac Newton b) Charles Darwin c) Watson and Crick d) Gregor Mendel
A community of organisms interacting with their physical environment is a(n)
A. population. B. ecosystem. C. biosphere. D. organism. E. macromolecular community.