22. The advantages of lipids in energy storage are:
a. lipids contain more energy per gram
than carbohydrates because they have more C-H bonds. Thus, stores of lipid are
lighter than carbohydrates containing equal amounts of energy.
b. Lipids are insoluble in water so they
don't dissolve in water and thus don't diffuse out of cells.
----- ----- 
Slichter