Final answer:
ATP is a type of nucleic acid, comprised of a nitrogenous base, a sugar, and three phosphate groups. It plays a crucial role in energy transfer within cells, essential for numerous metabolic processes.
Step-by-step explanation:
The type of biomolecule that ATP (adenosine triphosphate) is classified under is nucleic acids. ATP is made up of a nitrogenous base (adenine), a sugar (ribose), and three phosphate groups. The bond between the phosphate groups can be broken to release energy, which is utilized by cells to perform various functions. This energy release is central to many metabolic processes and is critical for proper cellular function.
Additionally, the four major classes of organic compounds essential to all living organisms are proteins, carbohydrates, lipids, and nucleic acids. Each of these classes plays a crucial role in the structure and function of cells, and ATP, as a high-energy molecule, plays a central role in energy transfer within the cell.