Phospholipids

• what is the name of the lipids found in cell membranes?

  phospholipids
• where are phospholipids found?

  in cell membranes
• what is the difference between phospholipids and triglycerides?

  PHOSPHOLIPIDS- one of the fatty acids is replaced by a phosphate group
• give details about the phosphate group?

  • hydrophilic
• are the fatty acids hydrophilic or hydrophobic?

  hydrophobic
• what do phospholipids make up?

  the bilayer of cell membranes
• what do cell membranes do?

  control what enters and leaves a cell
• what is the structure of phospholipids like?

  • hydrophobic tails
  • hydrophilic heads
• What layer do phospholipids form and why?

  • hydrophilic heads and hydrophobic tails
  • SO they form a double layer with their heads facing out towards the water on either side
• what is the centre of the bilayer like?

  HYDROPHOBIC
• What's the effect of the centre of the bilayer being hydrophobic?

  water-soluble substances cannot easily pass through it - the membrane acts as a barrier to those substances