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lipids
loosely defined group of molecules with one main chemical characteristics: they are insoluble in water
built from
fatty acids & glyerol
fatty acids
long-chain hydrocarbons w carboxyl group (COOH)
glyerol
3-carbon polyalcohol
saturated
no double bonds between carbon atoms (higher melting point, animal origin)
unsaturated
one or more double bonds (lower melting point, plant origin)
used for energy storage
release more energy on oxidation
phospholipid structure
glycerol, two fatty acids(nonpolar tails), phosphate group(polar head)
phospholipid bilayer
more complicated structure where two layers form: hydrophilic heads point outward & hydrophobic tails point inward toward each other
micelles
lipid molecules orient with polar (hydrophilic) head toward water and nonpolar (hydrophobic) tails away from water