01:119:115 Lecture Notes - Lecture 6: Lipid Bilayer, Glycolipid, Amphiphile

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Form a closed bilayer vesicle (closed internal environment) cylindrical shape, amphipathic (both polar and nonpolar) help by hydrophobic interactions: fluid mosaic model. B. 2. components can move easily within 1 layer. Fluidity depends on four factors (fatty acids can be solid/liquid) Temperature (b. 2. a. 1) low temperature = solidify, cell loses function. Chain length (b. 2. b. 1) long chains = less fluid. Saturation (b. 2. c. 1) unsaturated (good saturation) = more fluid (liquid) B. 3. a) peripheral (b. 3. a. 1) not embedded on surface (b. 3. a. 2) hydrophilic (inside) B. 3. b) integral (b. 3. b. 1) deeply inserted in membrane (b. 3. b. 2) hydrophobic (outside: membrane proteins (determine membrane functions) D. 1. polysaccharides attached to protein (glycoprotein) or lipid (glycolipid) Passive - does not use atp (a. 1. b. 1) diffusion, osmosis, etc (a. 1. b. 2) concentration gradient = stored energy. Diffusion is easy for (a. 2. b. 1) gases (o2, co2, n2) (a. 2. b. 2) (a. 2. b. 3) small nonpolar molecules small uncharged, polar molecules (h2o) Osmosis (diffusion of water) (high to low concentration) Direction of osmosis is dependent on solute concentration (a. 3. a. 1) solvent moves to area with more solute.

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