Lipids
Lipids are constituents of plants and tissues that are insoluble in water although soluble in organic solvents like ether, carbon tetrachloride, chloroform, or benzene. They added a large kind of elements of varying structures like oils and fats; steroids, phospholipids and so on. Lipids are commonly prepared of oxygen, hydrogen, and carbon. Some oxygen atoms in a lipid molecule is all time small than the number of carbon molecules. Sometimes small number of nitrogen, phosphorus and sulphur as well exist. They comprise a large portion of their structure such as a hydrocarbon. Lipids offer as energy save for make use in metabolism and as a main structural material in cell membranes for regulating the activities of cell and tissues.