Gave convention for identification of FA's. Also as double bonds increase, MP decreases and solubility in water goes up. Two fatty acids are essential in mammals. Mammals do not have the genes to code for the Nz to make these required FA's, therefore they must be provided in the diet. FA's are precursors for other lipids.
Waxes are esters of long chain aliphatic acids and alcohols.
This is waterproofing material in cuticle of leaf and preen of birds. Mono, di and triglycerides. Triglyceride is the storage form of energy in adipose tissue and provides for thermal and mechanical insulation. Also lipids are more efficient storage form of energy than CHO's because they are not hydrated. See text p. 366-67.