Membranes Phospholipids and Bilayers

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MembranesPhospholipids and Bilayers
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What do cell membranes consist of?

• Experiment

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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)
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Lipid packing
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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.
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Membrane fluidity Frye-Edidin experiment
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Membrane fluidity Frye-Edidin experiment
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Frye-Edidin experiment
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Frye-Edidin experiment
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