Chapter 3 - The Cell-Surface Membrane
- Created by: Chloe
- Created on: 27-03-14 12:40
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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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