An axon can be distinguished from a dendrite because an axon:
a. Frequently possesses stubby outgrowths called spines
b. Has a much thicker diameter close to the cell soma than at its end
c. Has much greater amounts of Nissl substance
d. Lacks ribosomes
e. Typically carries a wave of depolarization toward the cell soma
ANS: D
Axons have a thin, uniform diameter and lack ribosomes.
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