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What is the function of a selectively permeable membrane? A. It allows no large molecules to leave the cell and all large molecules to enter. B. It allows some molecules to enter the cell and blocks entry to others. C. It allows all molecules to enter the cell but blocks them all from leaving. D. It allows all molecules to enter the cell and allows all molecules to leave.

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B. It allows some molecules to enter the cell and blocks entry to others.

Answer: Option b: it allows some molecules to enter the cell and block entry to others.

Explanation: selective permeability allows those molecules to enter the cell which are small, uncharged. Large molecules pass slowly.

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