Aplasma membrane and a cell wall
are two names for the same thing
have the same structure and different functions
have different structures and the same function
have different structures and different functions

Have different structures and the same function.

Explanation:

Plasma membrane and cell wall have different structures and the same functions, because plasma membrane is a semipermeable membrane which have receptors it helps in cell to cell communication. On the other hand, cell wall is completely permeable membrane which does not have any receptors to communicate cell to cell.

Plasma membrane is made up of phospholipids and proteins, found in all types of cell and helps in protecting protoplasm. While cell wall is made up of cellulose found in the plant cell and protects the cell from external shock.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

explanation:

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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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