Cell Membranes

Cell Membranes - I. Cell Membranes a. Structure (table...

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I. Cell Membranes a. Structure (table 5.2): a. Made of proteins (50-60%) and lipids (40-50%) i. Lipids are primarily phospholipids, though there are also lipids such as cholesterol 1. Lipids: phospholipids have polar end and nonpolar end. a. Polars associate with each other and form rows, with nonpolar tails facing inward b. Fluid Mosaic Model: proteins and lipids can move around in the membrane i. Saturated fats (w/ more hydrogen attached) pack together better, make membrane less fluid ii. Unsaturated fats make membranes more fluid iii. Some cells can change the saturation of their fatty acids in the lipid tails of phospholipids to change the fluidity of the membrane as a whole c. Integral proteins go through membrane, while proteins that remain on the surface are peripheral proteins i. Amino acids in integral proteins towards edge of membrane polar, those towards inside nonpolar ii. Peripheral proteins may act as anchors to cytoskeleton, among other things d. Glycolipids are attached to the membrane, acting as tissue identity markers
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This note was uploaded on 05/07/2011 for the course BIO 191 taught by Professor Douglas during the Fall '10 term at Boise State.

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Cell Membranes - I. Cell Membranes a. Structure (table...

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