Answer:ATP
Step-by-step explanation:
The molecule that serves as usable energy for cells is adenosine triphosphate, or ATP. ATP is a nucleotide composed of adenine, a ribose sugar, and three phosphate groups. It is often referred to as the "energy currency" of the cell because it provides the energy needed for various cellular processes.
When ATP is broken down by hydrolysis, one of the phosphate groups is removed, releasing energy. This energy can be used by the cell to perform work, such as muscle contraction, active transport, or synthesis of molecules.
ATP acts as a temporary energy storage molecule that can be quickly synthesized and broken down as needed by the cell. It is constantly being produced through cellular respiration or other metabolic pathways, ensuring a steady supply of energy for cellular activities.
In summary, ATP is the molecule that serves as the usable energy for cells. It is involved in various cellular processes and provides energy through the breakdown of one of its phosphate groups.