Controversy surrounds the use of zinc-containing nasal sprays as a cold remedy, since they have been associated with anosmia (loss of smell). If true, this is likely due to the sprays damaging which tissue?
A. Neuroglial system
B. Central nervous system
C. Peripheral nervous system
D. Osmic nerve
Answer: C
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Suppose you take a cell from an adult cow and attempt to use it to produce a clone of that cow. If for
some reason telomerase is not functioning in that cell or in any cell that comes from it, what will you expect to happen with your clone?
a. The cell will never be able to divide at all. b. When the clone grows up, it will most likely have cancer. c. The cell may divide, but after a certain number of divisions, cell division will stop. d. The lack of telomerase should have no effect on the clone. e. When the clone grows up, it will most likely be sterile.
A muscle that decreases the angle between two bones at a joint is called a(n)
a. flexor. b. agonist. c. depressor. d. antagonist. e. extensor.
An ovarian follicle is indicated by
a. A. b. B. c. C. d. D. e. E.
Researchers applied radioactive phosphorus and radioactive calcium to a freshly cut tree stump. Eight days later, they came back to measure the distribution of the radioisotopes. They found that nineteen different species of shrubs and trees within a seven-meter radius had taken up the radioactive elements. No radioactivity was detected in the air. Radioactively labeled starch was later added to the stump; in subsequent observations, no labeled starch molecules were ever detected in neighboring plants. Which of the following is the most logical explanation for the observation?
a. During transport, the radioactive atoms are removed from the starch molecules. b. Starch molecules are too large to cross cell membranes. c. The radioactivity caused the starch molecules to break down. d. Water in the soil dissolved the starch molecules. e. The radioactive carbon atoms decayed into other atoms that are undetectable.