Bio 1002 Lecture 5 Notes

Bio 1002 Lecture 5 Notes - Bio 1002 Tom Haffie Lecture 5...

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Bio 1002 Tom Haffie Lecture 5 Read from sections 5.1 to the end of 5.2A Purple pages F-40 & F41 1. What are the fundamental aspects of the Fluid Mosaic Model o That the plasma membrane is rigid --> rather, it consists of proteins with a mixture of lipid molecules Consistency of olive oil o Membrane is selectively permeable --> allows for the uptake of key nutrients and elimination of waste products o Highly dynamic, --> the lipid molecules of the bilayer, flex back and forth, vibrate, spin and even exchange places with lipids in the same half. o The proteins and other components of one half of the protein are different from those of the other half of the membrane Referred to as, membrane asymmetry --> reflects that different functions are performed on different sides of the membrane 2. Basic structure of a lipid, a fatty acid.
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Unformatted text preview: o Polar head to interact with the aqueous environment --> consists of glycerol linked to different types of alcohols by a phosphate group o Interior - fatty acid tails - very hydrophobic, do not like to interact with aqueous an environment Will spontaneously form if put in a liquid environment 3. Role of hydrophobic effect in membrane formation o The tendency of polar molecules like water to exclude hydrophobic molecules like fatty acids, causes the formation of micelles, liposomes and phospholipid bilayers 4. What is meant by the terms saturated and unsaturated. o Unsaturated, has double bonds o Saturated = every carbon is single bonded to other carbons Phospholipids are linear --> greater interaction between lipids --> decreases membrane fluidity...
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