BIS 104 PQ 15 ans Spring 2010

BIS 104 PQ 15 ans Spring 2010 - relative long. Short chain...

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BIS 104 PQ 15 ans Spring 2010 15. a) Phospholipids are amphipathic: A molecule that is amphipathic has both hydrophilic and hydrophobic regions, thus giving it a dual nature. The amphipathic phospholipids will arrange themselves in an aqueous solvent so that their polar head groups will maximize their exposure to the solvent, while the hydrophobic fatty acid tails will group together internally to minimize exposure to the solvent. Therefore, a lipid bilayer membrane will always seal itself into a closed vesicle so that here are no free edges. b) The carbon schain length of the FA compopnent of phospholiids can range from short to
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Unformatted text preview: relative long. Short chain FAs tend to increase fluidity of a membrane, whereas long chain FAs tend to decrease the fluidity. Long chain FAs stack together more readily and tend to increase the liquid crystal nature in solution. c) The FAs can vary in the degree and pattern of saturation. Phospholipids with unsaturated FA chains (one or more double bonds) interfere with tight packing of the lipids and thus tend to make the membrane more fluid. Saturated FAs have the opposite effect....
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