Atp serves as the energy currency of the cell.
In physics, energy is the quantitative quality that is transferred to a body or to a physical system. It is recognized in the execution of work as well as in the form of heat and light (from the Ancient Greek: v, enérgeia, "activity"). Energy is a preserved resource; according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be created or destroyed. The joule, which is defined as "the energy transmitted to an object by the effort of moving it a distance of one metre against a force of one newton," is the unit of measurement for energy in the International System of Units (SI).
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