Lecture 3, Ch. 8

Lecture 3 Ch 8 - Lecture#3 Date Chapter 8~ Membrane Structure Function Membrane structure I Selective permeability Amphipathic~ hydrophobic

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Lecture #3 Date ______ Chapter 8~ Membrane Structure & Function
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Membrane structure, I Selective permeability Amphipathic~ hydrophobic & hydrophilic regions Singer-Nicolson: fluid mosaic model
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Membrane Structure QuickTimeᆰ and a Cinepak decompressor are needed to see this picture.
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Membrane structure, II Phospholipids ~ membrane fluidity Cholesterol~ membrane stabilization “Mosaic” Structure~ Integral proteins ~ transmembrane proteins Peripheral proteins ~ surface of membrane Membrane carbohydrates ~ cell to cell recognition; oligosaccharides (cell markers); glycolipids; glycoproteins
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Membrane structure, III Membrane protein function: transport •enzymatic activity •signal transduction •intercellular joining •cell-cell recognition •ECM attachment
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Membrane traffic Diffusion ~ tendency of any molecule to spread out into available space Concentration gradient Passive transport ~ diffusion of a substance across a biological membrane Osmosis ~ the diffusion of water across a selectively permeable membrane
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Diffusion QuickTimeᆰ and a Cinepak decompressor are needed to see this picture.
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Osmosis QuickTimeᆰ and a Cinepak decompressor are needed to see this picture.
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This note was uploaded on 10/31/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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Lecture 3 Ch 8 - Lecture#3 Date Chapter 8~ Membrane Structure Function Membrane structure I Selective permeability Amphipathic~ hydrophobic

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