What is the function of the cell membrane's selective permeability?

A. The selectively permeable membrane allows only certain substances to enter or exit the cell.
B. The selectively permeable membrane contains DNA used to make proteins.
C. The selectively permeable membrane packages proteins for transport.
D. The selectively permeable membrane allows all substances to enter and exit the cell.

The cell membrane's selective permeability allows only certain substances to enter or exit the cell. It helps maintain homeostasis and controls the movement of molecules.

Explanation:

The function of the cell membrane's selective permeability is to allow only certain substances to enter or exit the cell. This is important for maintaining homeostasis within the cell and controlling the movement of molecules. The cell membrane is made up of a phospholipid bilayer with embedded proteins that act as channels or transporters to facilitate the movement of specific molecules across the membrane. For example, the membrane allows small molecules like oxygen and carbon dioxide to freely pass through, while larger molecules like glucose or ions require specific transport proteins to cross the membrane.

This selectivity is crucial for the cell to control its internal environment and prevent harmful substances from entering or important substances from leaving. It also allows the cell to uptake necessary nutrients and eliminate waste products. Without selective permeability, the cell would not be able to maintain its internal balance and function properly.

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