The fetal period of prenatal development begins at ________ and ends at _______:
a. conception; birth
b. conception; the end of the 2nd month
c. the end of the 1st month; birth
d. the end of the 2nd month; birth
d
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Troy is trying to study, and his sister is in the next room, playing with some balloons. She counts "one, two, three," and just as she says "three" she pops one of the balloons with a pin. Each time a balloon pops Troy is startled and jumps. By the time his sister has popped six balloons Troy begins to cringe when he hears the counting start, before he actually hears the balloon pop. In this
example of classical conditioning, the cringing that Troy experiences when he hears his sister start counting is: a. a conditioned response b. an unconditioned stimulus c. an unconditioned response d. a conditioned stimulus
Which of the following is a contingent reinforcer?
a. The mother gives the boy a dollar and asks him to go to the store. b. Simone forgets to wash the dishes but gets to watch TV anyway. c. Billie has a temper tantrum, so his father lets him stay up late. d. Greta doesn't say please, but gets the candy.
During the __________ stage, the developing infant __________
a. zygotic; weighs about 1 ounce b. embryonic; is most vulnerable to the harmful effects of chemicals c. zygotic; fetal sex is determined d. embryonic; has a detectable heartbeat e. embryonic; slows its growth significantly
Which statement is true of drug effects?
A. Drugs vary widely in their effectiveness. B. Drugs continue to show increases of effect even with large doses. C. Heavier animals usually require lower drug doses than do lighter animals. D. A drug has only one effect.