Which of the following is true of chemical synapses? Select all correct choices
A. They are more common than electrical
synapses.
B. Their vesicles fuse with the presynaptic
membrane to release neurotransmitters.
C. Once released, their neurotransmitter
molecules may return to the presynaptic cell.
A,B,C
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The earliest RNA probably functioned in
A) catalysis. B) self-replication. C) both catalysis and self-replication. D) neither catalysis nor self-replication.
Which of the following is thought to be most closely related to the anthropoids?
a. lemurs b. galagos c. lorises d. tarsiers e. marsupials
Sometimes when a new mother is nursing her baby, she experiences abdominal cramping. Which hormone is responsible?
A) Estrogen B) Progesterone C) FSH D) Oxytocin E) Prolactin
Which of the following does NOT characterize tundra?
A. shrub B. trees C. permafrost D. caribou