The enzyme through which hydrogen ions (h ) travel back into the cell after being transported outside the membrane by the electron transport chain is called:

The correct answer is - ATP synthase.

Explanation:

The role of ATP synthase which is an enzyme highly present in all domains of living organisms by converting into chemical energy by producing ATP which is essential for the most of the cellular functions and reactions.

The proton or hydrogen ion is pumped during the electron transport chain is used to synthesize ATP. Protons move back into the matrix once it transported outside the cell.

Thus, the correct answer is - ATP synthase.

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d) center of the mid-ocean ridge

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