BI110 Chapter Notes - Chapter 5: Peripheral Membrane Protein, Lipid Raft, Membrane Protein
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Document Summary
Cell theory: all organisms are made up of cells, the cell is the fundamental unit of life, cells come from preexisting cells. Cell membranes evaporate cells from the external environment. Capable of forming barrier in aqueous (water) environments. Attached to lipids (glycolipids) and proteins (glycoproteins) Non-polar tail groups come together, away from water. Arrangement dependent on size of head groups. Lipids with bulky heads, single hydrophobic tail. Lipids with less bulky head, 2 hydrophobic tails. Form if phospholipids added to test tube with water (neutral ph) In test tube, phospholipids form enclosed spherical bilayers. Able to rearrange to ll missing portions. Lipids associate together by weak van der waals forces. Presence of double bonds on fatty acid tails. Result in phospholipids with straight structure favouring tight packing. Unsaturated fatty acids have one or more double bonds. Amphipathic structure of cholesterol allows it to pack tightly with phospholipids. Lipid rafts are regions on membrane that contain high concentrations of lipids.
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