When human volunteers were given high doses of AAS, ____
a. TSH levels increased
b. gonadotropin levels increased
c. natural testosterone levels increased
d. thyroxine levels decreased
e. TSH levels were unaffected
ANSWER: a
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Body weight is related to
a. caloric intake. b. energy utilization. c. genes. d. age and sex. e. all of these
A lizard with a striped tail is crossed with one having a spotted head, producing normal looking (no
stripes or spots) lizard progeny. What progeny would be expected to be produced by mating these progeny with each other, if the genes conferring stripes and spots were on different chromosomes? a. equal numbers of normal, striped, spotted and striped, and spotted b. 3 striped : 1 spotted c. 9 striped and spotted : 3 spotted : 3 striped : 1 normal d. 9 striped : 3 spotted : 1 striped or spotted e. 9 normal : 3 striped : 3 spotted : 1 striped and spotted
Which of the following statements about cancer defense is false?
a. Natural killer and cytotoxic T cells destroy cancer cells. b. Cancer antigens stimulate a strong immune response. c. Monoclonal antibodies can deliver toxic drugs to cancer cells. d. T cells produce interleukins, which defend against cancer. e. Macrophages produce tumor necrosis factor, which inhibits tumor growth.
In arthropods, locomotion is accomplished by muscles that work against
A. mineralized bones. B. the exoskeleton. C. each other. D. the pseudocoel. E. a hydrostatic skeleton.