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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 living cells, including the cells in your body and the cells in yeast, need energy for. cellular processes such as pumping molecules into or out of the cell or synthesizing. needed molecules. ATP is a special molecule which provides energy in a form that. cells can use for cellular processes. Cellular respiration is the process that cells use to transfer energy from the organic. molecules in food to ATP. The following equation summarizes the chemical changes. that occur in cellular respiration of the monosaccharide glucose when oxygen is. available.