Question

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the cell membrane, also known as the plasma membrane, separates the inside of the cell from the outside environment. it is a semipermeable barrier.
the latin prefix semi - means half, and permeable means having pores or openings that substances can pass through.
what is the significance of a semipermeable cell membrane?
the cell membrane does not allow any substances to enter or leave the cell.
the cell membrane only allows certain substances to enter or leave the cell.
the cell membrane allows all substances to enter or leave the cell.

Explanation:

The Latin prefix "semi -" means half. A semi - permeable membrane is not completely closed (like a non - permeable membrane) nor completely open (like a fully permeable membrane). Since "permeable" means having pores or openings for substances to pass through, a semi - permeable membrane allows only some substances (based on size, charge, etc.) to enter or leave the cell.

Answer:

The cell membrane only allows certain substances to enter or leave the cell.