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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 plant cells, which do not contain mitochondria, the energy for cellular functions is created by the chloroplasts, which, like a mini solar cell, convert sunlight into useful energy by the creation of sugar molecules through the process of Photosynthesis.ells need a source of energy, they get this energy by breaking down food molecules to release, the stored chemical energy.This process is called 'cellular respiration' . The process is happens in all the cells in our body.