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Question
In an aquatic microbial community where a photoautotroph, chemoorganoheterotroph, and nitrogen fixing bacterium are present, predict an environmental perturbation that would cause only one to be outcompeted by the other two groups and explain how each group would respond.Answer
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Which of the following statements about chlamydial infections is TRUE?
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A) incidence / prevalence
B) prevalence / mortality
C) mortality / morbidity
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Cholera is an example of a pandemic disease that
A) has multiple wild animal reservoirs and is thus difficult to eradicate.
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C) is spread through direct contact and has only a human reservoir.
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C) the vector is seasonal.
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A) Self-activation
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A) clonal anergy
B) clonal deletion
C) clonal anergy and deletion
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Clonal anergy is a state of
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An individual usually expresses ________ structurally distinct allele(s) that encode class I MHC proteins.
A) one
B) two
C) four
D) six