LIPID-

Lipids are the heterogeneous group of organic compounds related to fatty acids which are insoluble in water and soluble in organic solvents like ether, chloroform and benzene. It occurs widelyin plant and animal kingdom,eg. Oils, fats, waxes. Lipids are important dietary constituents on account of high caoric value.
IMPORTANT BIOLOGICAL FUNCTION-
1) In the body, fat serves as an efficient source of energy when stored in adipose tissue.
2) Lipid serves as an insulating material in the subcutaneous tissue and around certain organ.
3) Lipids provide essential fatty acids, which are not synthesized by human body.
4) Lipids are the carriers of fat-soluble vitamin.
5) Lipids are used to form substances essential for maintaining cellular integrity such as lipoproteins and glycolipids, in combination with proteins and carbohydrates respectively.
6) It provides building blocks for different high molecular weight substance.
7) They produce metabolites through oxidation in the tissues, which are used in the interconversion of substances.