Which of the following is a direct result of depolarizing the presynaptic membrane of an axon terminal?

A) Voltage-gated calcium channels in the membrane open.
B) Synaptic vesicles fuse with the membrane.
C) The postsynaptic cell produces an action potential.
D) Ligand-gated channels open, allowing neurotransmitters to enter the synaptic cleft.


A

Biology & Microbiology

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Which are likely involved in promoting cell differentiation during animal development?

A. differential distribution of cytosolic factors among early embryonic cells B. extracellular signals C. cellular receptors D. specific morphogens E. All of the choices are correct

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Regarding transitions between stages of the cell cycle, scientists have

a. already discovered many of the proteins involved b. figured out how the proteins communicate with each other c. determined how the proteins operate as small nano-machines to perform their functions d. shown that mammalian cells are easier to work with than Saccharomyces cerevisiae e. no idea which proteins are needed

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Normal cell functions of noneukaryotes are disrupted by 

A. enzymes. B. mitochondria. C. antibacterial antibiotics. D. cell walls.

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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

Biology & Microbiology