ATP is widely used in biochemical research as a critical energy source in cellular processes. It plays a vital role in studying enzyme kinetics, particularly in reactions involving energy transfer, such as those catalyzed by kinases and ATPases. In molecular biology, ATP is essential for PCR (polymerase chain reaction) and DNA ligation, where it provides the energy required for these processes. Additionally, it is used in cell culture studies to maintain cellular energy levels and investigate metabolic pathways. ATP is also employed in diagnostic assays to measure cellular health and energy metabolism. In the pharmaceutical industry, it serves as a reference standard for drug development targeting energy-related disorders.