What is a molecule present in all living cells and acts as an energy source for metabolic processes?

Adenosine triphosphate (ATP) is the molecule present in all living cells that acts as a primary energy source for metabolic processes. It stores energy in its high-energy phosphate bonds, which can be released and utilized for various cellular activities, such as muscle contraction, active transport, and biOSynthesis. ATP is often referred to as the "energy currency" of the cell due to its critical role in energy transfer within biological systems.