Summation of EPSPs and IPSPs occurs at the _____ of the neuron
a. dendrites
b. trigger zone
c. nodes of Ranvier
d. axon terminals
Answer: b. trigger zone
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A human cell and a mouse cell were experimentally fused, and the results demonstrated that ________
a. proteins cannot move laterally in the membrane b. large polar molecules can enter cells only through transport proteins c. proteins can move laterally in the plasma membrane d. human/mouse chimeric embryos are not viable
How does the binding of a regulatory molecule to the allosteric site affect the activity of an enzyme? (Check all that apply.)
A. It may change the maximum velocity of the enzyme. B. It may decrease the activity of the enzyme. C. It may increase the activity of the enzyme. D. It may change the affinity of the enzyme for its substrate. E. It causes the enzyme to denature and become inactive. F. It may cause the active site to disappear altogether. G. It may change the shape of the enzyme.
What term denotes the range of all factors that influence whether a species can obtain resources
essential for survival and reproduction? a. habitat b. niche c. carrying capacity d. ecosystem e. community
What are the main steps of biogenesis, in the correct order?
A) Polymers, monomers, self-replicating molecules, first cells B) Self-replicating molecules, monomers, polymers, first cells C) Monomers, self-replicating molecules, polymers, first cells D) Monomers, Polymers, self-replicating molecules, first cells