Which statement characterizes cancer cells?
a. Mitosis in cancer cells is strictly regulated.
b. Cancer cells form tumors that adhere strongly to surrounding tissues.
c. Cancer cells display uncontrolled cell division.
d. Tumors formed by cancer cells remain encapsulated and only grow in one location.
e. Cancer cells behave like normal cells.
ANSWER: c
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Which of the following is common to both factor-dependent and factor-independent transcription termination?
A. Both types of termination involve NusA protein. B. Both types of termination are associated with rho termination factor. C. Both types of termination occur following a pause by the polymerase. D. None of the above are correct.
A patient comes to the emergency room suffering from severe dehydration. You are shocked to hear an orderly suggest, “We should just give him an IV of water to speed up his rehydration!” You quickly intervene, knowing this could cause grave harm. Why?
a. An IV of pure water would increase the tonicity of the blood so much that the red blood cells would shrivel from water loss. b. Pure water is known to be toxic and must be heavily diluted before given to patients. c. An IV of pure water would dilute the solute concentration of the plasma so much that the red blood cells would take on too much water through osmosis and burst. d. Pure water would make the cells and the plasma isotonic, and the patient would not rehydrate at all.
Chronically high blood pressure is called
a. ventricular fibrillation. b. hypertension. c. leukemia. d. sickle-cell anemia. e. a stroke.
For a freshwater fish, the output from the kidney in Figure 48-2 would be:
a. a small volume of hypotonic urine. b. a large volume of hypotonic urine. c. a small volume of hypertonic urine. d. a large volume of hypertonic urine. e. a small volume of isotonic urine.