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W1OutlineLec2 - Luis David Gomez 59866865 Bio 192 D103 Cell...

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Luis David Gomez 59866865 Bio 192 D103 Cell Biology Week 1 Lecture 2 Outline 1/ 9/08 Biological Membranes Fluid Mosaic Model and the Lipid Bilayer Features Lipid bilayer with proteins inserted Found in all cells prokaryotic/eukaryotic Biological membranes are permeable to charged molecules Hydrophobic core Asymmetric distribution of lipids/proteins Functions Permeability barrier—separate inside from outside Selective Permeability Flexible—allow communication with environment (fluidity) Membrane Leaflets exoplasmic side--outside cytosolic side—inside Lipds Amphiphatic—hydrophilic (polar) head and hydrophobic (nonpolar) Structure lead to various Density/fluidity head group degree of backbone saturation length of backbone type of backbone How do lipids aggregate? Shape One tail—cone shape Two tails—cylindrical shape Principle is the same—hydrophobic tail arrange with hydrophilic heads Why are the cisternae of the Golgi apparatus flat?
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