Bio Notes Chapter 5 - Chapter 5- Membrane Structure and T...

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Unformatted text preview: Chapter 5- Membrane Structure and T ransport Membranes Structure Support I) Structure – see table 5.2 A.-D. = History/Skipped E. Davson and Danielli (1930’s) RBC’s Predicted a diameter of 8nm Question. Chemical composition? D and D found proteins too! (In addition to phospholipids) Lipoprotein sandwich model F. 1950’s – Robertson Used electron microscope to see plasma membrane 1972: G. Singer & Nicholson i. Variation in “d” ii. Variation in lipid content iii. Variation in protein content Better electron Microscopes and techniques All plasma membranes have bilayer of phospholipids. Proteins exist in patchy network, not single layer. Eukaryotic cells also have cholesterol. I I) Why “fluid mosaic”? Both and proteins move around Similar to fig. 5.4 Fig 5.3 Why “mosaic”? Even though proteins are moving, each cell has its own “certain pattern” III)Movement of molecules Fig 5.9 Nice summary a. Simple diffusion High to low permeability High to low b. Facilitated diffusionb....
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This note was uploaded on 04/07/2008 for the course BISC 207 taught by Professor Skopik during the Fall '07 term at University of Delaware.

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Bio Notes Chapter 5 - Chapter 5- Membrane Structure and T...

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