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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.
What the Expert Says: Cells (and organisms) use energy for things like growing, dividing, making proteins, metabolizing food, and removing wastes, all being processes that require cells to make or break chemical bonds and move matter from one place to another.