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MDCAT Biology QUESTION #11237
Question 1
The fluid mosaic model of the cell membrane describes the membrane as:
  • A rigid lipid bilayer with fixed protein positions
  • A phospholipid bilayer with embedded proteins that can move laterally✔️
  • A single layer of phospholipids with proteins on the outer surface
  • A carbohydrate bilayer with lipid channels
Correct Answer Explanation
The fluid mosaic model (Singer & Nicolson, 1972) describes the cell membrane as a phospholipid bilayer with proteins embedded within it. Both lipids and proteins can move laterally, giving the membrane its fluid nature.