Chapter 3 - The Cell-Surface Membrane

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  • Created by: Chloe
  • Created on: 27-03-14 12:40

Phospholipids

  • One layer of phospholipids has its hydrophilic heads pointing inwards (interacting with the water in the cell cytoplasm)
  • The other layer of phospholipids has its hydrophilic heads pointing outwards (interacting with the water that surrounds all cells)
  • The hydrophobic tails of both phospholipid layers point into the cetre of the membrane - protected from the water on both sides

Lipid-soluble material moves through the mebrane via the phospholipid portion. The functions:

  • Allow lipid-soluble substances to enter and leave the cell
  • Prevent water-soluble substances entering and leaving the cell
  • Make the membrane flexible

Proteins

  • Extrinsic Proteins - Occur either on the surface of the bilayer or only

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