1. Pages 40 to 41

2.  Chemical composition  Carbon, hydrogen, oxygen and sometimes phosphorus  Building Blocks  Glycerol with 1 to 3 fatty acids  Phospholipids have glycerol, 2 fatty acids and a phosphate  Structure  Long chains (triglycerides and phospholipids)  Ring structure (steroids)

3. Fig. 5-11 Fatty acid (palmitic acid) Glycerol (a) Dehydration reaction in the synthesis of a fat Ester linkage (b) Fat molecule (triacylglycerol)

4. Fig. 5-13 (b) Space-filling model (a) Structural formula Fatty acids Choline Phosphate Glycerol Hydrophobic tails Hydrophilic head

5. Fig. 5-15

6.  Examples  Fats  Oils  Waxes  steroids  Functions  Energy storage  Protection  Chemical messenger

7.  Common Property  Nonpolar/Hydrophobic  Does not dissolve in water Hydrophilic head Hydrophobic tail WATER

8.  Saturated  All single Carbon to carbon bonds  Examples Animal fat Butter Lard  Not very good for you  Unsaturated  One or more double carbon to carbon bonds  Examples Plant oil – olive, corn, sunflower, etc…  Better for You

9. Fig. 5-12 Structural formula of a saturated fat molecule Stearic acid, a saturated fatty acid (a) Saturated fat Structural formula of an unsaturated fat molecule Oleic acid, an unsaturated fatty acid (b) Unsaturated fat cis double bond causes bending