The evolution of populations due to chance is
A. natural selection.
B. genetic drift.
C. gene flow.
D. has more effect in large populations than in small populations.
E. genetic variation.
B. genetic drift.
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Which of the following contraception techniques consists of avoiding intercourse during the time of
the month when the egg can be fertilized?
a. withdrawal b. tubal ligation c. dilation and evacuation d. rhythm method e. time of the month method
Dreaming occurs
a. after the first 15 minutes of sleep. b. after the first 30 minutes of sleep. c. after the first 45 minutes of sleep. d. during REM sleep. e. any time an individual is sleeping.
Which of the following is not a function of an antibody?
A) activate complement cascade B) attract phagocytes C) stimulate helper T cells D) neutralize toxins
The tuberculin response is mediated by
A. memory T cells. B. mast cells. C. B lymphocytes. D. plasma cells. E. eosinophils.