Question

Why is a cell membrane able to regulate substances that go into and leave cells?

A) The cell membrane contains tiny gates that control the movement of substances.
B) The cell membrane has a selective permeability that allows it to control the passage of molecules.
C) The cell membrane is rigid and prevents the entry or exit of substances.
D) The cell membrane relies on external factors to regulate substances.

Answer 1

The cell membrane is selectively permeable to control the movement of substances.

Step-by-step explanation:

The cell membrane controls the movement of substances in and out of the cells and organelles. It is selectively permeable to ions and organic molecules. It plays a role in cell adhesion, cell signaling, and attachment surface for the cytoskeleton to shape the cells and attach to the extracellular matrix to hold them together in tissues.