The cascade of events determining whether bacteriophage lambda elects to purpose lysogeny or a lytic cycle begins with a race between the production of the lambda repressor and ________.
A. endolysin
B. integrase
C. N protein
D. Cro protein
Answer: D
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An oxidase test was performed on two organisms for quality control purposes. Pseudomonas aeruginosa and Stenotrophomonas maltophilia tested positive and negative, respectively. Which of the following statements explains this discrepancy?
a. The oxidase reagent is most likely expired. b. The organisms are most likely old and therefore are not properly reacting. c. These organisms are poor choices for quality control purposes; both are oxi-dase-negative organisms. d. No discrepancy is present. The correct results are obtained.
How would an animal compensate for a nonfunctional lateral line?
A. Sex recognition by male fish would have to be accomplished by the olfactory structures. B. Pressure waves in the water would have to be detected by other sensory structures. C. Propulsion and directional control would have to be facilitated by other fins. D. Gas exchange through the gill slits would have to be increased. E. Skeletal support would need to be reinforced internally.
Which enzyme is a topoisomerase?
A. DNA polymerase I B. DNA polymerase III C. DNA gyrase D. DNA ligase
Which group of photosynthetic, mostly marine protists was named for the motion created by their two whip-like flagella?
A) Dinoflagellates B) Apicomplexans C) Euglenids D) Cercozoans E) Amoebas