The E. coli origin, oriC, contains:
A. four 9-base-pair consensus sequences.
B. three AT-rich direct repeats.
C. eleven GATC sites.
D. four 9-base-pair consensus sequences and three AT-rich direct repeats.
E. four 9-base-pair consensus sequences, three AT-rich direct repeats, and eleven GATC sites.
E
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A pressurized airplane cabin and an oxygen tent over a patient in a hospital both impact the respiration rate of a person. How do these compare?
A. Both use the same mechanism to force hemoglobin to increase affinity for oxygen. B. The oxygen tent increases concentration of O2 while the airplane maintains total air pressure without changing concentrations. C. The oxygen tent and the airplane increase the air pressure to increase the PCO2. D. The oxygen tent and airplane cabin pressure lowers the partial pressures for normal breathing.
Which of the following statements concerning centrioles is FALSE?
a. They are present in most animal cells but not most plant cells. b. They are duplicated before cell division. c. They have a 9 + 2 arrangement of microtubules. d. They are found in the centrosome. e. They are thought to play a role in microtubule assembly.
The cells lining the small intestine have projections into the lumen of the intestine. These projections, combined with the highly folded layering of cells lining the lumen, function to
A) facilitate countercurrent exchange. B) decrease the reabsorption of water. C) slow the nerve impulses that trigger peristalsis. D) increase the surface area for nutrient absorption. E) increase the rate of peristalsis.
Which of the following inhibits protein synthesis?
A. Dapsone B. Penicillin C. Erythromycin D. Isoniazid