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MembranesPhospholipids and Bilayers
What do cell membranes consist of?
Experiment:A B C D E F
10 cc of milk
10 cc of vinegar
10 cc of oil
10 cc of vinegar
piece of red cabbage
10 cc of vinegar
10 cc of milk
10 cc of water
5 drops of washing up liquid
10 cc of oil
10 cc of water
5 drops of washing up liquid
piece of red cabbage
10 cc of water
5 drops of washing up liquid
results:
milk clotted
results:
oil floats on top
results:
bright pink colour leaks out
results:
milk emulsified (little droplets)
results:
oil emulsified
(little droplets)
results:
violet colour leaks out
Conclusions: Cell membranes consist of proteins and fats (lipids)
Lipid packing
Arrangements of lipids in aqueous media
Hydrophobic surfaces such as fatty acid chains aggregate in aqueous solutions, caused by aversion of water molecules to hydrophobic surfaces which force the water into ordered structures. Alternative structures with the hydrophobic surfaces as compact as possible are favoured.
Membrane fluidity: Frye-Edidin experiment
Membrane fluidity: Frye-Edidin experiment
Frye-Edidin experiment
Frye-Edidin experiment