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Lipids (Storage Lipids (Fatty Acids (Melting point is also influenced by…

- - - - polyunsaturated fatty acids with double bond between 3rd and 4th carbon from methyl end are called omega-3s, omega-6s have double bond between C6 and C7
    - - The longer the chain and the fewer the double bonds, the lower the solubility in water
    - - Unsaturated are liquid at room temp
      - Saturated are solid at room temp
      - Difference in melting point is due to different degrees of packing of fatty acid molecules
        
        kinked can't pack together as tightly, interactions are weaker, markedly lower melting points
    - - Constructed from fatty acids
        
        Made up of three fatty acids each in an ester linkage with a single glycerol
        
        Nonpolar, hydrophobic, essentially insoluble in water
        
        due to ester linkages
      - Provide stored energy and insulation
        
        In vertebrates, adipocytes, or fat cells, store large amounts of triacylglycerols as fat droplets that nearly fill the cell
        
        Also stored as oils in the seeds of many plants
        
        The advantage of this type of fat storage is that the carbon atoms of fatty acids are more reduced than those of sugars, so oxidation of triacylglycerols yields more than twice as much energy as the oxidation of carbohydrates. Also, hydrophobic means that organism that carries fat doesn't have to carry water around