Organic compounds are broadly classified into four groups namely carbohydrates, lipids, nucleic acids, and proteins.
• Carbohydrates contain sugars and these sugars act as the main source of energy for the living organism. Some times excess sugar is stored in special form and released as and when required.
• Lipids are biological macromolecules that are non soluble in water. They also help to store the energy and supply the energy to our body, in absence of carbohydrates source. They are also important components of biological membranes.
• Nucleic acids act as the source of heredity information transfer between the generations of the same species. They are mainly of two types, deoxyribonucleic acid and ribonucleic acid.
• Proteins are the macromolecular bio-molecules that are formed from the monomers of amino acids. They are considered as the building blocks of an organism and help in its growth and development.