Question

unit 1.4 cell transport, homeostasis, feedback quiz 2025
the cell membrane contains channels and pumps that help move materials from one side to the other. what are these channels and pumps made of?
○ carbohydrates
○ bilipids
○ proteins
○ lipids

Explanation:

To solve this, we recall the structure and function of the cell membrane. The cell membrane has channels (like ion channels) and pumps (like protein pumps for active transport) that facilitate the movement of materials across it. These channels and pumps are integral membrane proteins. Carbohydrates in the membrane are mainly for cell recognition, lipids (phospholipids) form the bilayer structure, and "bilipids" is not a standard term for membrane components related to transport channels/pumps. So the correct component is proteins.

Answer:

C. proteins