Unit 6 Membranes

Unit 6 Membranes - W h a t is a m e m b ra n e ? U n it 6 P...

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1 Unit 6 Part 2 MEMBRANES out in What is a membrane? bilayer protein lipid Phospholipids form bimolecular sheets in water micelle liposome bilayer H 2 O Hydrophilic heads interact with water Hydrophobic tails interact with each other H 2 O Chemistry of bilayer formation
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2 fatty acid tails vary • length • saturation phospholipid sphingolipid • cholesterol Membrane lipids PHOSPHOLIPIDS Membrane lipids have different R groups phosphate ester linkage cis double bond choline serine ethanolamine inositol gangliosides and blood groups “AB” person - can receive A, B or O “A” person - can only get A or O “B” person - can only get B or O You don’t make antibodies to your own blood antigens receptor for pathogens influenza
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3 cholesterol all MEMBRANE lipids are amphipathic O2, CO2, N2 H2O, urea, glycerol Glucose, sucrose Cl– , K+, Na+ High permeability Low permeabilit y O2, CO2 H2O Glycerol, urea Glucose Cl– K+ Na+ Permeability scale (cm/sec) Size and charge affect the rate of diffusion
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This note was uploaded on 12/10/2009 for the course MCDB 1150 at Colorado.

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Unit 6 Membranes - W h a t is a m e m b ra n e ? U n it 6 P...

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