09-18-06 (7) Lipids - Lipids Lipids Diverse group of...

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Lipids September 18, 2006
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Lipids Diverse group of hydrophobic molecules The one class of large biological molecules that does not consist of polymers (they’re not made up of monomers)
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Lipids are hydrophobic Hydrophobic behavior is based on molecular structure Lipids consist mostly of hydrocarbons
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Fats Constructed from two types of smaller molecules Glycerol Fatty acids Assembled by dehydration reactions
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Fats *A fatty acid can be joined to each group
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Fats Fats Esther group
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Fatty Acids Vary in length (typically 12-18 types) Vary in the number and location of double bonds
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Saturated Fatty Acids Have the maximum number of hydrogen atoms possible Stearic acid **No double bonds
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Unsaturated Fatty Acids Have one or more double bonds cis double bond causes bending Oleic acid *Unsaturated fatty acids make unsaturated fats which are typically liquids at room temperature (oily)
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Hydrogenated Fats Hydrogens added to unsaturated fatty acids to make them saturated Sometimes results in the formation of trans- fatty acids
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