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A: Cells use energy in order to grow, regulate metabolism and reproduce. This energy is obtained from a source such as food molecules or light from the sun, and through processes like glycolysis, the citric acid cycle and oxidative phosphorylation, an energy-rich molecule is then created.
Since the mitochondria generate energy for the cell, they are also called, the batteries of the cell, powering all cellular activities. Mitochondriaare the organelles that convert chemical energy, stored in food, into a compound that can be used by the cell. The mitochondria break down food and turn it into energy for the cell to use. Inside the mitochondria energy is stored and food is converted for use in a cell.