Question

This is a series of energy-producing chemical reactions, which produce 34 atp for the cell, occur in the mitochondria, and form the last step of aerobic cellular respiration.

Answer 1

The Electron Transport Chain (ETC), involving chemiosmosis, using oxygen (aerobic), and the last step being oxidative phosphorylation.
That last step indicates that O2 will be the final proton acceptor when an inorganic phosphate (Pi) is added to (phosphorylates) ADP --> ATP