All cells are enclosed by a plasma membrane that is similar in structure and function. Cells have outer plasma membrane that regulates that is not only what enter in the cell.
Prokaryotes and eukaryotes both cells possess internal membrane that encase their organelles and control the exchange of essential cell components. The endoplasmic reticulum which has the structure similar to that plasma membrane which also considered as the cell membrane.
Yes plasma membrane and cell membrane are same , both are biological membrane which separate the interior of cell from the cells's extracellular space.The cell membrane is the security guard because the membrane controls what goes in and out of a cell like a security guard which control goes in and out of the gate.
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