Phospholipid bilayer

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  • Created by: Lucy
  • Created on: 19-05-14 17:41
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  • phospholipid bilayer
    • phosphate head is polar; one end is slightly positive, the other slightly negative. It attracts other polar molecules, like water, so is hydrophilic.
    • phosphate tails are non-polar so are hydrophobic.
    • In a cell, which are filled with watery/aqueous cytoplasm and surrounded by aqueous tissue fluid, phospholipids form a bilayer.
      • the lipid bilayer is of critical biological importance, as it will close on itself so that there are no edges with exposed hydrogen chains- forms compartments.
      • this avoids hydrophobic tails being in contact with the water on either side of the membrane and ensures the hydrophilic heads are in contact with the water.
    • may also form micelles in water ( a layer on the surface) these are spherical clusters that do not occur in cells.




very nice!

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