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What is the role of phospholipids in cell membranes?

Practice Questions

Q1
What is the role of phospholipids in cell membranes?
  1. Energy storage
  2. Genetic information storage
  3. Structural integrity and barrier function
  4. Catalysis of biochemical reactions

Questions & Step-by-Step Solutions

What is the role of phospholipids in cell membranes?
  • Step 1: Understand that phospholipids are special molecules that have a 'head' and two 'tails'.
  • Step 2: The 'head' of the phospholipid is attracted to water (hydrophilic), while the 'tails' are not (hydrophobic).
  • Step 3: In a cell, phospholipids arrange themselves in two layers, with the heads facing outward towards the water inside and outside the cell.
  • Step 4: This arrangement creates a barrier that protects the inside of the cell from the outside environment.
  • Step 5: The bilayer structure also allows certain substances to pass in and out of the cell, maintaining the cell's integrity.
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