The Selectively Permeable Membrane

Question

The selectively permeable membrane
A) is a result of its composition; it is tough connective tissue, much like a ligament.
B) determines which substances enter and leave the cell.
C) allows for the unrestricted movement of water and electrolytes across the cell membrane.
D) permits diffusion but not osmosis.

Accepted Answer

A selectively permeable membrane is a membrane that allows certain molecules or ions to pass through via diffusion, passive transport or active transport. This allows the membrane to determine which substances enter or leave the cell. It is not composed of tough connective tissue (A), nor does it allow for unrestricted movement of water and electrolytes (C) or permit diffusion but not osmosis (D).