Rationale: - ATP (Adenosine Triphosphate): ATP is a nucleotide that stores energy in its high-energy phosphate bonds. When these bonds are broken (hydrolyzed), energy is released, powering cellular processes like muscle contraction, protein synthesis, and nerve impulse transmission. This energy release is readily available and directly usable by the cell, making ATP the most immediate and versatile energy source. The cell continuously cycles between creating ATP (during cellular respiration) and