Morphine, heroin, and codeine are effective because they imitate the action of our natural ____
a. ?excitatory neurotransmitters
b. ?tryptamines
c. ?endorphins
d. ?catecholamines
ANSWER:
c
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Which of the following describes how AIDS kills its victims?
a. The virus prevents new cell growth. b. The virus weakens the body to other diseases. c. The virus attacks the brain. d. The virus poisons the blood.
Most schools have comprehensive sex education programs
A) ?True. B) ?False.
Most definitions of abnormality
a. are those which are based on statistics. b. are relative and take context into consideration. c. use the concept of social nonconformity as the main basis for judgment. d. can be made using only a person's subjective discomfort as a guide.
Which of the following statements about handedness is true?
a) Identical twins are more likely than ordinary siblings to differ in handedness. b) In adulthood, people who are right-handed have lower life expectancy and are more likely to die in accidents. c) The prevalence of left-handedness in some African countries is as high as 50%. d) One-half of left-handers process language in both hemispheres of the brain rather than primarily in the left hemisphere.