Bio5 LECTURE 5

Bio5 LECTURE 5 - STEROIDS: Lipid molecules containing the...

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LIPIDS a diverse and chemically-unrelated group of molecules that are non-polar and hydrophobic – insoluble in water although many contain polar bonds, they are mostly composed of hydrocarbon
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FATS: esters of fatty acids and glycerol
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FATTY ACIDS: Long chain hydrocarbons with a carboxyl group Fatty acids are generally 14-22 carbons in length Fatty acids may be saturated and contain no double bonds OR they may be unsaturated and contain one or more double bonds Fatty acids in fats and other biological lipids are “CIS” geometric isomers
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FATTY ACIDS Animal fats are principally composed of saturated fatty acids with high melting points. These are solid at room temperature. e.g. butter and lard Plant fats are principally composed of unsaturated fatty acids and are liquid at room temperature. e.g. corn oil, linseed oil
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Unformatted text preview: STEROIDS: Lipid molecules containing the complex four ring structure known informally as the phenanthrene nucleus Steroids containing a hydroxyl group at the third position are known as sterols. Those with a ketone group are called sterones CHOLESTEROL is the principal sterol found in animals THE BAD FATS trans fats fats containing the trans geometric isomer of fatty acids trans fats arise from hydrogenation of vegetable oil during food processing THE BAD FATS Atherosclerosis - hardening of the arteries due to plaque deposition - leads to heart attack and/or stroke PHOSPHOLIPIDS Phospholipids are esters of fatty acids, glyerol and a polar head group Phospholipids are amphipathic, with both polar and non-polar ends...
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This note was uploaded on 04/07/2008 for the course BIO 5A taught by Professor Zhu/cardullo/rao during the Winter '08 term at UC Riverside.

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Bio5 LECTURE 5 - STEROIDS: Lipid molecules containing the...

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