In cells, the energy available in food is used to make an energy-rich compound called

a. water

b. glucose

c. ATP

d. ADP

The answer is letter C. ATP.

ATP stands for Adenosine Triphosphate which is present in every cell’s cytoplasm and nucleoplasm which is essential in all the physiological mechanisms. It is considered as the energy currency of life or the "molecular unit of currency". It stores the energy that we need every day to do our daily undertakings. The primary function of ATP is to transport chemical energy within the body cells for metabolism. It is said that 1 moleculte of ATP is composed of 3 phosphate groups.