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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.
It is produced in the mitochondria during cellular respiration, and a little is produ â¦ ced in the light dependent reactions of photosynthesis, but this is later used up in the light independent reactions. ATP is used as an energy source for cells to carry out functions like active transport.When a cell needs energy, it breaks one of the phosphates off of the ATP, which releases energy. After this, the ATP is called ADP (adenosine diphosphate). + 2 others found this useful.TP is used as an energy source for cells to carry out functions like active transport. When a cell needs energy, it breaks one of the phosphates off of the ATP, which releases energy. After this, the ATP is called ADP (adenosine diphosphate). + 2 others found this useful.