_ regulates the selective permeability of the plasma membrane, allowing movement of molecules according to the needs of the cells.

Explanation

Membrane proteins regulate the selective permeability of the plasma membrane, allowing the movement of molecules according to the needs of the cell. These proteins can act as:- Channels: allowing certain molecules to pass through the membrane- Transporters: actively moving molecules across the membrane- Receptors: recognizing and binding to specific molecules, triggering responses- Enzymes: catalyzing reactions within the membraneMembrane proteins control the flow of molecules across the membrane, ensuring that the cell maintains homeostasis and regulates the exchange of nutrients, waste products, and signaling molecules.