The structure you are describing is the plasma membrane (or cell membrane) of the cell. It is composed of a lipid bilayer, primarily made of phospholipids, with embedded proteins that help regulate the movement of substances in and out of the cell. The plasma membrane is essential for maintaining the internal environment of the cell and facilitating communication and transport with the external environment.
a lipid bilayer outside of the cytoplasm of the cell that controls what enters and leaves the cell is what?
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