A substance has to pass through various parts of a plant cell before reaching the nucleus. Which of the following shows the correct order of these parts?

cell wall, cell membrane, cytoplasm

Explanation:

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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the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.