Question

Energy currency of a cell

Answer 1

Energy is usually liberated from the ATP molecule to do work in the cell by a reaction that removes one of the phosphate-oxygen groups, leaving adenosine diphosphate (ADP).so the energy currency of the cell is ATP.

Answer 2

It's ATP .Adenosine Triphospate is the energy currency of cell which is manufactured by mitochondria.
Hope my answer helps you.