LSD is thought to act in the brain by influencing __________
a. serotonin
b. dopamine
c. endorphins
d. norepinephrine
a
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Chirag's spinal cord was completely severed at the neck in an auto accident. He would still be able to
A. wiggle his toes. B. exhibit the "knee-jerk" reflex in response to a tap on the knee. C. feel the pain of a pin prick on his foot. D. snap his fingers.
What do dogs' communication methods and songbirds' communication methods have in common?
A. Both can make sounds that indicate danger. B. In both cases, the males make sounds that attract females. C. Dogs and songbirds both communicate in structurally complex ways. D. Neither can use sounds to indicate different behaviors.
Andrea, a customer care executive, is able to clearly determine if her caller is a child or an adult. Which of the following dimensions of sound plays the most important role in Andrea's ability to distinguish voices?
A. timbre B. amplitude C. frequency D. loudness
When examining the rates of homosexuality between identical twins and fraternal twins or non-twin siblings, researchers found that if one identical twin is gay, his brother has a __________ percent chance of being gay as well, and if a fraternal twin is gay, his brother has a __________ percent chance of being gay as well.
A. 21; 7 B. 52; 22 C. 75; 18 D. 98; 33