Reading 96.116 notes

Reading 96.116 notes - iv. Phospholipids automatically fill...

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Reading 96-116 I. What is the structure of a biological membrane? a. Lipids constitue the bulk of a membrane 1. Fluid mosaic model-Phospholipid bilayer serves as a lipid lake in which a variety of proteins float 2. Carbohydrates are used to identify specific molecules ii. Hydrophilic regions 1. The phosphorus containing head of the phospholipid is electrically charged and hence associates with polar water molecules iii. Hydrophobic regions: the long nonpolar fatty acid tails of the phospholipid associate with other nonopolar materials but they do not dissolve in water of associate with hydrophilic substances 1. One way for lipids and water to coexist is for the phospholipid to form a bilayer a. Fatty acid tails in and polar heads out
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Unformatted text preview: iv. Phospholipids automatically fill holes. 1. Helps the membrane fuse during vesicle formation phagocytosis and related processes v. Phospholipids differ in 1. Fatty acid chain length 2. Degree of unsaturation 3. And polar groups present vi. The outside and inside of the phospholipid is quite different b. Membrane proteins are asymmetrically distributed i. In plasma membranes 1 protein for every 25 phospholipids ii. Membrane proteins 1. Hydrophilic regions: a. Stretches of amino acids with hydrophilic side chains. b. These domains interact with water sticking out into the aqueous extracellular environment of cytoplasm 2. Hydrophobic regions: a. Stretches of amino acids with hydrophobic side chains...
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This note was uploaded on 10/14/2009 for the course BIS 64982 taught by Professor Comai during the Spring '09 term at UC Davis.

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Reading 96.116 notes - iv. Phospholipids automatically fill...

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