A selectively permeable membrane ensures that

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A selectively permeable membrane allows certain molecules and ions to pass through while restricting the passage of others. Essential macromolecules and other polar molecules cannot easily pass through the membrane by diffusion; therefore, the membrane ensures that they do not leave the cell. This allows the cell to maintain its structure and function. Other substances may pass through by active transport or endocytosis/exocytosis.

A Selectively Permeable Membrane Ensures That