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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.
Cell Energy. Date. Energy within a cell exists in the form of chemical energy. A source of this chemical energy is a. compound called adenosine triphosphate (ATP). ATP when changed to a compound called. adenosine diphosphate (ADP) releases energy for biological work in a cell.