BIOL 2500 Lecture Notes - Microfilament, Microtubule, Active Transport
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Document Summary
Hydrophobic = repelled by water: phospholipids contribute to dynamic of membrane because they can shift/move, glycolipids (~5%) lipids with sugar groups attached, cholesterol (20%) polar and non polar regions, non polar wedge into tails of phospholipids and contribute to stability, on outer membrane surface, dynamic assembly of saturated phospholipids, sphingolipids and, lipid rafts (20%) cholesterol. Functions: transport, channels let certain substances come through plasma membrane, carrier let certain substances in and out of the cell, but they also bind the substance and change shape, bind substances relay messages to cell interior, receptor, enzyme, cell junctions, tight junctions intergral proteins of neighbouring cells fuse together, keep things from moving in between the cells, ex: digestive tract, desmosomes like velcro: protein filaments eztend from adjacent cell and link together, gap junctions channels of adjacent cells connect, only junction that allows cell to cell.