A pseudomonad that loses its R plasmid in the soil is LEAST likely to
A) cause an infection in a human.
B) colonize a surface.
C) infect a shrub.
D) survive a habitat dominated by antibiotic-producing Streptomyces spp.
Answer: D
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What is the key factor determining whether or not attenuation will occur when transcription of the E. coli trp operon has been initiated?
A. The trp operon repressor B. The level of tryptophan in the environment C. The activity level of adenyl cyclase D. The level of trp-tRNA that is charged with tryptophan
If E. coli bacteria are grown only in the presence of lactose, then the repressor will
A. not bind the operator, allowing transcription of the lac operon genes. B. bind the operator, preventing transcription of the lac operon genes. C. bind the operator, allowing transcription of the lac operon genes. D. not bind the operator, preventing transcription of the lac operon genes. E. bind the operator, preventing translation of the lac operon genes.
Most of the water moving through a plant is lost
through a. osmotic gradients in the soil. b. transpiration. c. pressure flow forces in the xylem. d. photolysis. e. photosynthesis.
Which of the following are always photosynthetic?
A) macroparasites B) microparasites C) hemiparasites D) holoparasites