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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.
All cells metabolize sources of energy to keep them ticking over in terms of making energy molecules they can use to do 'work' with, or making structural components for the cell.