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Which structure controls what goes into and out of the cell?

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Final answer:

The plasma membrane forms a barrier between the cell's cytoplasm and the external environment. It controls what goes in and out of the cell through selective permeability. Understanding its composition is key to understanding how it controls the movement of substances.

Step-by-step explanation:

The Plasma Membrane

The plasma membrane (also known as the cell membrane) forms a barrier between the cytoplasm inside the cell and the environment outside the cell. It protects and supports the cell and also controls everything that enters and leaves the cell. It allows only certain substances to pass through, while keeping others in or out. The ability to allow only certain molecules in or out of the cell is referred to as selective permeability or semipermeability. To understand how the plasma membrane controls what crosses into or out of the cell, you need to know its composition.