Rhizobium bacteria benefit legumes in a mutual symbiosis by ______________.
A. decomposing complex organic material and building humus in the topsoil
B. releasing excess Nitrogen into the water
C. fixing atmospheric Nitrogen into the soil in a chemical form plants can use
D. weathering bedrock into soil particles such as clay, sand, and silt
E. performing photosynthesis
Answer: C. fixing atmospheric Nitrogen into the soil in a chemical form plants can use
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Two technologies that sped progress of the human genome project in 1991 were
A) recombinant DNA technology and PCR. B) amniocentesis and chorionic villus sampling. C) the invention of the Internet and personal computers. D) expressed sequence tags and microarrays.
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According to the animation, surgical infections account for what percentage of nosocomial infections?
A) 15% B) 40% C) 11% D) 8% E) 20%
Injectable drugs are tested for endotoxins by
A) the Limulus amoebocyte lysate test. B) counting the viable bacteria. C) filtering out the cells. D) looking for turbidity. E) culturing bacteria.