BIOL 118 Lecture Notes - Lecture 2: Lipid Bilayer, Isoprene, Synthetic Membrane

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17 Feb 2017
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A layer of molecules, mostly lipids, that surrounds a cell. Separates the life inside the cell from the external environment. A generic term for a carbon- containing compound that is mostly nonpolar and hydrophobic. Hydrocarbons- molecules that only contain hydrogen and carbon: e. g. isoprene, fatty acid. A hydrocarbon chain bonded to a carboxyl group: most fatty acids have long hydrocarbon chains that are atleast 14-20 carbons. Fatty acids and the hydrocarbon isoprene are the key building blocks for lipids. They can be: saturated- only single bonds between carbons, unsaturated- one or more double bonds between carbons that form kinks in the chain. Highly saturated lipids are solid (e. g. butter: very long, highly saturated fats are more solid (wax) But lipids with unsaturated fats are liquids at room temperature (oil: there are 3 types of lipids found in cells. Lipids are defined by their insolubility in water: a physical property rather than by chemical structure, their structures vary widely.

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