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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.
The main function of mitochondria is to metabolize or break down carbohydrates and fatty acids in order to generate energy. Eukaryotic cells use energy in the form of a chemical molecule called ATP (adenosine triphosphate).