Cholesterol

• Where is cholesterol found in the plasma membrane?


  Within the phospholipid bilayer of the cell-surface membrane.
• Is cholesterol hydrophobic/phillic? How does this help its function?


  Hydrophobic which helps prevent water loss and dissolved ions from the cell.
• What is a cholesterol's function?


  Adds strength to the membrane.

  Prevents loss of water and dissolved ions.

  Reduces lateral movement of phospholipids by pulling fatty acid tails together.

  Makes membrane less fluid at high temps.