Answer:
DNA (nucleic acid):
DNA is a hereditary material that contains genetic information for all the biological functions in living organisms. The information is encoded in the form of sequence of nucleotides which are translated into protein through RNA transcription (central dogma of life). All information that plays a role in the formation and maintenance of any organism is derived from DNA.
Fat (lipids):
Within an organism's body, energy is stored in the form of fat (triacylglyceride molecules). Fat also maintains the body temperature by acting as an insulator for energy exchange with the environment. Furthermore, cell membrane is made up of a lipid bilayer that acts as a selectively permeable membrane for nutrients exchange.
Sugar (Carbohydrates):
Sugar molecules or carbohydrates are the instant source of energy for living organisms. The energy molecules (ATP) are produced during breakdown of sugar molecules to simple inorganic molecules (C6H12O6 + H20 + O2 -> CO2 + H2O + Energy). The energy is stored in the muscles in the form of glycogen (another form of sugar).