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ATP-synthase converts ADP into ATP, a process called charging. Shown behind ATP-synthase is the membrane in which the ATP-synthase is mounted. For the ATP that is charged in the mitochondria, ATP-synthase is located in the inner membrane.
Best Answer: The addition of a third phosphate group to ADP turns it into ATP. ADP (Adenosine DI-phosphate) has two phosphate groups, hence the DI. The addition of the third phosphate turn ADP into ATP (Adenosine TRI-phosphate), which is where the TRI comes from.