membrane_structure - Membrane Structure I. II. III. IV....

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Membrane Structure I. Introduction II. Membrane Functions III. Fluid Mosaic Model of Membrane Structure IV. Membrane Lipids A. Phospholipids B. Glycolipids C. Cholesterol V. Membrane Proteins A. Integral B. Peripheral VI. Membrane Dynamics A. Lipid asymmetry B. Lipid mobility C. Protein asymmetry
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Introduction Two membranes in cells Cell (plasma) membrane - defines cell boundaries Internal membranes - define a variety of cell organelles
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Membrane Functions Form selectively permeable barriers Transport phenomenon Cell communication and signaling Cell adhesion and attachment Cell identity and antigenicity
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Fluid Mosaic Model Mosaic - an object comprised of bits and pieces embedded in a supporting structure Membrane lipids= support membrane proteins = “bits and pieces” both contribute fluidity
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Membrane Lipids : phospholipids Most abundant of the membrane lipids Composition glycerol backbone two long, non-polar fatty acid hydrocarbon tails variable phosphate- containing polar group Amphipathic
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membrane_structure - Membrane Structure I. II. III. IV....

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