Complete the statements about the different types of lipids. are the building blocks for many lipids and generally contain an even number of carbon atoms and an unbranched hydrocarbon chain. are lipid compounds that contain a fused ring system. These compounds contain three six-membered rings and one five-membered ring, and some of these compounds are found in biological membranes. are formed when a carbohydrate is glycosidically linked to a hydroxyl group of a lipid. These compounds are also found in biological membranes and include gangliosides and cerebrosides. are the storage form of lipids that accumulate in adipose tissue and can be used as metabolic fuel. These compounds have a polar head, made of three ester groups, and a nonpolar fatty acid tail. are made up of a long-chain amino alcohol joined to a fatty acid by either a glycosidic or phosphodiester linkage. These compounds, which are commonly found in the nervous system, do not contain glycerol. are formed when glycerol is esterified to two fatty acids and a phosphoric acid molecule. These compounds are also found in biological membranes.