BIOL 1090 Lecture Notes - Lecture 9: Antonie Van Leeuwenhoek, Integral Membrane Protein, Lipid Bilayer
2 Nov 2016
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Document Summary
Bio 1090 review: cell size 10-3 meters. Structurally simplier does not mean worse at surviving: plants cells: have chloroplasts and cell walls, electron microscopy: electrons increase resolution, properties, complex and organized, genetic- coded activity, reproduce division, energy, engage in mechanical activities. Compartments: membrane bound structures dedicated to a particular function. Sequesters keep contents from mixing with each other. Amphipathic: having both hydrophobic and hydrophilic regions. Cooling decreases fluidity = crystalline gel temperature. Balance between ordered(rigid) and disordered structure allows: It also alters packing and flexibility of lipids. If added to crystalline gel, fluidity will increase. If added to a liquid crystal, fluidity will decrease. Lipid anchored: proteins attach to the lipid bilayer. Peripheral: membrane proteins associate with the surfaces of the lipid bilayer. Many plasma membranes, the outer leaflet contains glycolipids and glycoproteins. Lipids move laterally within leaflet, movement is slow. Movement of proteins is restricted rapid movement is limited long range diffusion is slow.
