Cell membranes

• Fluid mosaic model

  Proteins are scattered throughout the bilayer

  Phospholipids constantly move
• Structures within a membrane


  Cholesterol

  Channel proteins and carrier proteins

  Receptor proteins

  Glycoproteins

  Glycolipids
• Proteins with a polysaccharide chain attached

  Glycoprotein
• Lipids with a polysacharide chain attached

  Glycolipid
• Role of channel proteins and carrier proteins

  Allow large molecules and ions to pass through the membrane
• Role of cholesterol

  Fit between phospholipids by binding to the tails

  Causing them to pack more closely restricting the movement making it more rigid

  Help maintains shape of animal cells