Lipids are essential for storing energy. Just like carbohydrates, there are made from atoms of carbon, hydrogen, and oxygen. Unlike macromolecules, lipids do not form polymers. The thing that makes lipids special is that the all have little or no affinity for water. This is due to the fact they consist mostly of hydrocarbons, which form non polar covalent bonds. These molecules are known as hydrophobic(“ water fearing”). Although lipids are not strictly polymers, they are large molecules assembled from smaller molecules by dehydration reactions. A fat is constructed from two kinds of smaller molecules: glycerol and fatty acids. glycerol is a three-carbon alcohol with a hydroxyl group attached to each carbon. It is linked to fatty
