In what two ways is ATP used in coupled reactions?
A coupled reaction is where a catabolic reaction drives an anabolic reaction, usually with ATP as an intermediary. The energy released from the first reaction allows for the formation of ATP from ADP and P. The second reaction is then driven by the hydrolysis (breakdown) of ATP, which releases energy.



So the answer to your question is: In a coupled reaction, ATP is first used to store energy from a catabolic reaction and then used to release energy for an anabolic reaction.