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ATP(Adenosine Tri Phosphateis called the energy currency of a cell.
It is so called because it provides the energy required during various metabolic activities occurring in a cell.
Hydrolysis of ATP is exergonic and hence it provides the sufficient amount of energy required by a cell.

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adp is also a part of it>
Oh yeah..That's true. ATP is nothing but ADP(Adenosine Di Phosphate) + P(1 inorganic phosphate).
okk edited it now
Adenosine tri phosphate is the energy currency of the cell.
As food in the cells is gradually oxidized, the released energy is used to re-form the atp so that the cell always maintains a supply of this essential molecule.
 This conversion of atp to adp is an extremely crucial reaction for the supplying of energy for life processes.
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adp is also a part of it<
so edit it now to get extra points