Answer:
ATP
Step-by-step explanation:
Adenosine Triphosphate (ATP) is an organic compound composed of an adenine nucleotide base attached to a ribose sugar and three (3) phosphate groups bonded to one another by high-energy (phosphoanhydride) bonds. In the ATP molecule, the ribose sugar is attached to a phosphate group. ATP is known as the energy unit of the cell because the energy released by the hydrolysis of phosphoanhydride bonds can be used to drive unfavorable reactions. ATP is also involved in intracellular signaling pathways by acting as a substrate for kinase proteins that transfer phosphate groups during phosphorylation.