When Warnecke and colleagues were looking for genes that are involved in the digestion of lignocellulose by termites, they needed genes __________
A) from the sequences of the termite genome
B) of the primary strain of bacteria that inhabit the termites' bodies
C) for the bacterial enzymes found in the lignocellulose-digesting part of the gut
D) for the long-term maintenance of lignin-digesting microbial organisms
E) that can be expressed in a lignocellulose-rich environment
C
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In the absence of tryptophan, __________
A) the inactive repressor cannot bind trpO, so operon gene transcription occurs B) the active repressor binds trpP, so operon gene transcription is repressed C) the inducer cannot bind trpO, so operon gene transcription occurs D) the active repressor cannot bind trpO, so operon gene transcription is attenuated E) the repressor binds the corepressor, and operon gene transcription occurs
At equilibrium, which of the following statements is TRUE when helium and nitrogen are present in a gas at equal partial pressures over water?
A) The partial pressure of nitrogen is greater than the partial pressure of helium. B) The concentrations of helium and nitrogen in the gas are equal. C) The concentrations of helium and nitrogen in the water are equal. D) The partial pressures of helium and nitrogen in the water are equal. E) The concentrations of helium and nitrogen in both the water and gas are equal.
Which of the following is primarily responsible for cell elongation, gravitropism, and apical dominance implants?
A. Auxin B. gibberellin C. Cytokinin D. Phytochrome E. ethylene
When DDT was first introduced, insects were very
susceptible to it. The development of resistance to DDT by insects was the result of a. special creation. b. natural selection of forms that expressed genes for resistance. c. the high biotic potential of insects. d. a naturally occurring example of inheritance of acquired characteristics. e. mutation induced by DDT.