Members of the Archaea:
A) are often founds in extreme environments
B) sometimes produce methane gas
C) all of these are true of Archaeans
D) are prokaryotes
E) are more closely related to eukaryotes than to bacteria
Ans: C) all of these are true of Archaeans
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Symbiotic nitrogen fixation can consume up to ________% of the ATP generated by the host plant.
A. 5 B. 50 C. 30 D. 20
When communities of organisms interact with their physical environment they form a(n)
A. population. B. organism. C. community. D. ecosystem. E. macromolecular community.
When DNA ligase is used to combine a human fragment with a plasmid, the result is a redundant
plasmid. __________________ Indicate whether the statement is true or false.
An antimicrobial's therapeutic index is
A) The drug level required for clinical treatment of an infection B) The drug level at which the agent becomes too toxic for the host C) The ratio of the toxic dose to the therapeutic dose D) The level of effectiveness in a population