Final answer:
The cell gets the energy required to form ATP from ADP by breaking down food molecules through processes like glycolysis and cellular respiration. This energy is stored in the ATP molecule's phosphate bonds and can be released when necessary.
Explanation:
Within the cell, the energy required to form ATP from ADP comes from the breaking down of food molecules in processes like glycolysis and cellular respiration. During these processes, energy is released, and this energy is used to convert a molecule of ADP into ATP. The bond between the second and third phosphates in ATP stores this energy, which can be released when needed by breaking this bond.
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