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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.
Several types of energy conversion occur in cells. Respiration is the process by which raw fuel energy is converted to a form that can be used for cellular work. Cellular work is a set of processes that includes routine housekeeping as well as special functions such as mitosis. All cells respire and do work.