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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.
In the process of making sugar, plant cells also lock some of the energy they collected from sunlight into the sugar molecule. Okay, great. So how do cells (remember, both plant and animal cells need energy, and neither can directly use the energy provided by the sun) get the energy out of the sugar molecule? They do it with a process called cellular respiration. In cellular respiration, cells use oxygen to break the sugar molecule.