Question

Which of these molecules require a carrier protein to pass through the cell membrane?

• A. Small neutral solutes
• B. Water
• C. Polar molecules
• D. Non – polar molecules

Answer 1

Answer:

C. Polar molecules

• Since the cell membrane is a phospholipid bilayer having non – polar lipid tail groups, polar molecules cannot pass through the membrane without the assistance of carrier proteins present within the membrane.