01:119:115 Lecture 6: Lecture 6 Notes
20 Nov 2016
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Document Summary
Due to shape and amphipathic nature-> hydrophobic and hydrophilic sides of phospholipids so forms spontaneously. Membrane components can move laterally within 1 layer of membrane. Chain length of tails and bends in tails. Amount of cholesterol which acts as a spacer. Cholestrol reduces membrane fluidity at moderate temperature but at low temperatures hinders solidification. Can determine where creature is from based on these features. We are mostly saturated fatty acids in our cell membranes. Unsaturated tails prevent packing (fluid) (helps thing move in acidic) Can move but not flip (always facing same direction) Polysaccharides attached to protein: (glycoprotein) or lipid (glycolipid) Water diffuses: low to high concentration of solute or high to low concentration of solvent. Salt draws h2o out of cells and dehydrates us. Osmosis tonicity: ability of solution to make cell gain/lose h2o. Concentration of solute outside > concentration of solute inside. Concentration of solute outside < concentration of solute inside.
