Exposure to benzene is linked to ____
a. leukemia
b. lung cancer
c. bladder cancer
d. skin cancer
e. liver cancer
ANSWER: a
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You are studying the hormonal control of metamorphosis in amphibians. If the anterior pituitary was prevented from
releasing TSH, what would be the effect on tadpoles?
a. Metamorphosis to adult frogs would be increased five-fold. b. Metamorphosis to adult frogs would not occur. c. Calcium secretion in tadpoles would be inhibited. d. Metabolism in tadpoles would be greatly increased. e. Metamorphosis would proceed, but arrest after limb formation.
Antihistamines are most likely to interfere directly with which of the following nonspecific immune responses?
a. constriction of bronchioles b. leaking of fluid into infected tissues c. production of mucus d. production of antibody e. activation of natural killer cells
The human endoskeleton is composed primarily of
a. calcium, iron, and collagen. b. elastin, calcium, and phosphorus. c. myosin, actin, and calcium. d. myosin, actin, and phosphorus. e. collagen, calcium, and phosphorus.
Which one of the following statements is false concerning matter?
A. Matter is anything that has mass and takes up space. B. Air is matter. C. All matter has the same density. D. The phases of matter are determined by the relative amounts of energy in the matter's molecules.