Each of the following is a mechanism for drug resistance transfer between microorganisms, except ________.
A. R-plasmids
B. mutation
C. conjugation
D. transposons
Answer: B
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An anthropologist discovers the fossilized heart of an extinct animal. The evidence indicates that the organism's heart was large, was well-formed, and had four chambers, with no connection between the right and left sides
A reasonable conclusion supported by these observations is that the _____. A) animal had evolved from birds B) animal was endothermic and had a high metabolic rate C) animal was most closely related to alligators and crocodiles D) species had little to no need to regulate blood pressure
In a photosystem, clusters of chlorophyll a, chlorophyll b, and carotenoid pigments function most like
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Which one of the following is a primary component of both living organisms and the Earth's crust?
A. silicon B. hydrogen C. oxygen D. carbon E. nitrogen