[Campbell Biology P.176] The "fluid mosaic model" describes the plasma membrane as a mosaic ... | Practice Question

The "fluid mosaic model" describes the plasma membrane as a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids. What key property of the membrane is highlighted by the term "fluid"?

  • A: The membrane is rigid and static, maintaining a fixed structure.
  • B: Components like phospholipids and proteins can move laterally within the membrane.
  • C: The membrane is permeable to all substances, allowing free passage.
  • D: The membrane can easily be dissolved in water.

Explanation

The term "fluid" in the fluid mosaic model refers to the dynamic nature of the membrane, where phospholipids and proteins are not rigidly fixed but can move laterally within the plane of the membrane. This fluidity allows for various cellular processes like cell growth, movement, and division.