Neurotransmitters affect postsynaptic cells by _____
I) initiating signal transduction pathways in the cells
II) causing molecular changes in the cells
III) affecting ion-channel proteins
IV) altering the permeability of the cells
A) I and III
B) II and IV
C) II and III
D) III and IV
E) I, II, III, and IV
Answer: E
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Fill in the blank(s) with the appropriate word(s).