How is the type of neurotransmitter used by a particular neuron determined?
a. The postsynaptic (target) cell determines which neurotransmitter the presynaptic cell will release
b. The genes of the presynaptic cell determine which neurotransmitter the cell will use.
c. The neurotrophins released by the postsynaptic (target) cell determine the neurotransmitter the presynaptic cell will use.
d. Guidepost cells determine the type of neurotransmitter used in particular systems.
a
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With regard to biological differentiation of the sexes, which is FALSE?
a. It is possible for a male (XY) fetus to develop a female internal reproductive system. b. The male hormone testosterone affects the development of the brain and nervous system. c. External genitalia are fully differentiated by the fourth week after conception. d. Hormones influence the development of the testes and ovaries.
The free-running daily cycle of human beings is _________ hours long
a. between 22 and 23 b. between 23 and 24 c. between 24 and 25 d. more than 30
John B. Watson argued for a psychology based on the study of
a. stream of consciousness. c. measurable behavior. b. unconscious mental processes. d. sensation, feelings, and mental images.
In operant conditioning an organism learns to respond because
a. involuntary behaviors are elicited. b. of the consequences of the behavior. c. genetic predispositions invoke the behavior. d. a psychological mechanism, known as the operant, forces the organism to perform the behavior.