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Energy is usually liberated from the ATP molecule to do work in the cell by a reaction that removes one of the phosphate-oxygen groups, leaving adenosine diphosphate (ADP). When the ATP converts to ADP, the ATP is said to be spent.nergy is usually liberated from the ATP molecule to do work in the cell by a reaction that removes one of the phosphate-oxygen groups, leaving adenosine diphosphate (ADP). When the ATP converts to ADP, the ATP is said to be spent.
Everything you do needs energy to drive it, whether it is running up a flight of stairs, eating breakfast, fighting off an infection, or even just producing new proteins for hair growth. The energy currency used by all cells from bacteria to man is adenosine triphosphate (ATP). Every process within an organism â DNA and protein synthesis, muscle contraction, active transport of nutrients and ions, neural activity, maintenance of osmosis, carbon fixation â requires a source of ATP. Why is ATP such a good source of energy? ATP is a nucleoside triphosphate (ribose sugar, adenine base and three phosphate groups), where a high-energy bond attaches the third phosphate group to the molecule. This bond is highly unstable, and when it is hydrolysed it releases a substantial amount of free energy (approximately 7 kcal/mole).