Final answer:
Adenosine Triphosphate (ATP) is a high-energy compound that plays a critical role in cellular processes. It is composed of an adenine base, ribose sugar, and three phosphate groups.
Step-by-step explanation:
Adenosine Triphosphate (ATP) is a nucleotide composed of an adenine base bonded to ribose sugar by an N-glycosidic bond and three phosphate groups. It is classified as a high-energy compound because the two covalent bonds linking its three phosphates store a significant amount of potential energy. In the body, the energy released from these high-energy bonds helps fuel a variety of cellular processes.