Which of the following statements is incorrect about the fluid mosaic model?
Fats in the membrane act as gatekeepers, helping substances pass through.
The fluid mosaic model (Singer and Nicolson, 1972) describes the plasma membrane as a phospholipid bilayer with proteins embedded in it.
Phospholipids have hydrophilic heads facing outward and hydrophobic tails facing inward, and the molecules can move laterally, rotate and occasionally flip — giving fluidity. These statements are true.
The 'gatekeeper' role — controlled passage of substances — is performed by membrane proteins such as channels, carriers and pumps, not by the fats.
Hence, the incorrect statement is: Fats in the membrane act as gatekeepers, helping substances pass through.
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