APchapter7notes - Chapter 7 notes M embr ane Str uctur e...

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    Chapter 7 notes Membrane Structure and Function
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    Concept 7.1 Most abundant lipids in membranes are  phospholipids . - phospholipids are  amphipathic  (head is  hydrophilic, tail is hydrophobic ) Phospholipids and proteins are arranged in the  fluid mosaic model ”: membrane is fluid w/  proteins embedded in or attached to the  bilayer
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    Concept 7.1 Hydrophilic head WATER Hydrophobic tail WATER
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    Concept 7.1 Phospholipids and proteins are arranged  in the “ fluid mosaic model ”: membrane  is fluid w/ proteins embedded in or  attached to the bilayer - disproved the Davson-Danielli  “sandwich” model
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    Concept 7.1 Phospholipid bilayer Hydrophobic regions of protein Hydrophilic regions of protein
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    Concept 7.1 The membrane is fluid -membranes are not static sheets of  molecules locked in place -the membrane is held together  primarily by hydrophobic interactions
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    Concept 7.1 (a) Movement of phospholipids Lateral movement ( 10 7 times per second) Flip-flop ( once per month)
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    Concept 7.1 (b) Membrane fluidity Fluid Unsaturated hydrocarbon tails with kinks Viscous Saturated hydro- carbon tails
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    Concept 7.1 Membranes are mosaics of structure and  function - proteins are embedded in the fluid  matrix; the lipid bilayer is the main fabric  of the membrane, but proteins  determine its specific fcn.
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    Concept 7.1 Fibers of extracellular matrix (ECM) Glyco- protein Microfilaments of cytoskeleton Cholesterol Peripheral proteins Integral protein CYTOPLASMIC SIDE OF MEMBRANE Glycolipid EXTRACELLULAR SIDE OF MEMBRANE Carbohydrate
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This note was uploaded on 01/26/2011 for the course BIO 101 taught by Professor Siller during the Spring '10 term at University of Minnesota Duluth.

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APchapter7notes - Chapter 7 notes M embr ane Str uctur e...

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