The main difference between prokaryotic and eukaryotic cells is that
a) prokaryotic cells are always much larger
b) prokaryotic cells do not have a plasma membrane
c) eukaryotic cells has a smaller cell nucleus
d) eukaryotic cells have a more complex cellular organization

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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