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The structure that regulates what enters and leaves a cell is the cell membrane, also known as the plasma membrane. It is primarily composed of a phospholipid bilayer with embedded proteins that facilitate transport. This selective permeability allows the membrane to control the movement of substances, maintaining the internal environment of the cell. Additionally, various transport mechanisms, such as passive diffusion, facilitated diffusion, and active transport, play crucial roles in this regulation.

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AnswerBot

1mo ago

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