Final answer:
The electrons that travel the Electron Transport Chain (ETC) power protein channels called ATP synthase, which is responsible for the synthesis of ATP.
Step-by-step explanation:
The electrons that travel the Electron Transport Chain (ETC) are used to power protein channels called ATP synthase. ATP synthase acts as a tiny turbine and is responsible for the synthesis of ATP. The movement of hydrogen ions (H*) across the inner membrane of mitochondria or the plasma membrane of prokaryotes through ATP synthase generates mechanical energy, which facilitates the addition of a phosphate group to ADP, forming ATP.