In phage ?, the relative affinities of the lambda repressor and the cro protein to the three binding sites in the OR region are:
A. the same.
B. inversely proportional
C. unrelated.
B
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Which of the following organisms are resistant to destruction by typical disinfection methods?
A. Endospores of Bacillus and Clostridium B. Pseudomonas C. Non-enveloped viruses D. Mycobacterium spp. E. All of the choices are correct.
Picea glauca is a seed-bearing plant. What other characteristic MUST be true of this species?
A. It produces flowers. B. It produces fruits. C. The gametophyte is the dominant generation. D. It has vascular tissue. E. Double-fertilization results in the production of endosperm.
Phanerochaete chrysosporium
A. is a wood-decay fungus. B. is a lichen that serves as food for reindeer. C. is the cause of lung disease. D. is an hallucinogenic mushroom. E. is a rust that causes oak trees to shed their leaves prematurely.
Which of the following is an advantage of using Bt to control insects?
A. Bt does not accumulate in the soil or in nontarget animals. B. Bt is easily degraded in the natural environment. C. It is a rather new agent, being only a few years old, so insects have not had time to develop resistance. D. Two of these are useful traits for the safe use of Bt to control insects.