3.5 - Lipids: Hydrophobic Molecules

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Last updated 7:29 PM on 9/1/26
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10 Terms

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lipids

loosely defined group of molecules with one main chemical characteristics: they are insoluble in water

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built from

fatty acids & glyerol

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fatty acids

long-chain hydrocarbons w carboxyl group (COOH)

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glyerol

3-carbon polyalcohol

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saturated

no double bonds between carbon atoms (higher melting point, animal origin)

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unsaturated

one or more double bonds (lower melting point, plant origin)

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used for energy storage

release more energy on oxidation

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phospholipid structure

glycerol, two fatty acids(nonpolar tails), phosphate group(polar head)

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phospholipid bilayer

more complicated structure where two layers form: hydrophilic heads point outward & hydrophobic tails point inward toward each other

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micelles

lipid molecules orient with polar (hydrophilic) head toward water and nonpolar (hydrophobic) tails away from water