What is the function of phospholipids in the plasma membrane? A. to maintain the intracellular fl uid at a similar composition to that of the interstitial fl uid. B. to form channels to selectively allow passage of small molecules. C. to act as receptors for signalling chemicals. D. to present a barrier to the passage of water-soluble molecules
Option D. Molecules that are soluble in water cannot skip through lipid (fat). So the phospholipids are a barrier.
