Human pathogens fall into the group called ________.

A. acidophiles
B. mesophiles
C. thermophiles
D. psychrophiles
E. halophiles


Answer: B

Biology & Microbiology

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Which zone produces the most global oxygen gas?

A) A B) B C) C D) D E) E

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The primary, natural habitat of a pathogen where it continues to exist is called the ________.

A. fomite B. source C. reservoir D. vector E. carrier

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Which of the following observations were an outcome of studies by David Tilman and coworkers at Cedar Creek, Minnesota on ecosystem stability? Check all that apply. 

_____ Plots with more species showed less year-to-year variation in biomass. _____ Species-rich plots were less affected by drought than species-poor plots. _____ Over-yielding was observed in more recent work at Cedar Creek. _____ Nitrogen uptake and total biomass produced were negatively correlated to species richness. _____ More diverse plots were less susceptible to invasion by new species.

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Membrane proteins may function in

A) receiving extracellular signals. B) amphipathic modification. C) temperature control. D) protein manufacture. E) information storage.

Biology & Microbiology