If a symbiont either harms or lives at the expense of another organism, the relationship is called ________.
A. parasitism
B. pathogenicity
C. commensalism
D. symbiosis
Answer: A
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Transfection is:
A. the artificial introduction of viral DNA into a bacterial cell. B. the artificial introduction of viral DNA into a eukaryotic cell. C. the first step (attachment) of a viral infection using a recombinant virus. D. facilitated by treatment of cells with calcium chloride and heat shock. E. useful when recombinant DNA is not introduced via infection by a viral vector.
Ecosystems typically support which two types of food webs?
a. decomposing and detrital b. producing and detrital c. grazing and detrital d. producer and consumer e. grazing and hunting
The gaseous plant hormone is
a. auxin. b. gibberellin. c. cytokinin. d. abscisic acid. e. ethylene.
A student drops his notes, and his papers scatter. The fact that the papers scatter and do not remain neatly stacked is an illustration of
A) the first law of thermodynamics. B) the second law of thermodynamics. C) an increase in entropy. D) both the first and second laws of thermodynamics. E) an increase in entropy as predicted by the second law of thermodynamics.