Answer:
When ADP convert to ATP an input of energy to attach a third phosphate group.
Explanation:
The ATP is known as 'Energy currency of cell'. It contains 3 high energy phosphoanhydryde bonds. While ADP has only 2 phosphoanhydryde bonds.
It forms during via condensetion during reaction during the glycolysis, Oxidative phosphorilation, and photosynthesis.
When ATP convert to ADP to produce energy, this energy used during the cellular work and biosynthesis process inside a cell.
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