Human pathogens fall into the group called ________.
A. acidophiles
B. mesophiles
C. thermophiles
D. psychrophiles
E. halophiles
Answer: B
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Which zone produces the most global oxygen gas?
A) A B) B C) C D) D E) E
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
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.
Membrane proteins may function in
A) receiving extracellular signals. B) amphipathic modification. C) temperature control. D) protein manufacture. E) information storage.