Which of the following statements about the proton motive force is INCORRECT? A. The proton motive force is a cross-membrane proton electrochemical gradient. B. Generation of the proton motive force in mitochondria requires O2 . C. Generation of the proton motive force in mitochondria requires succinate. D. The free energy represented by the proton motive force in mitochondria is about -21.8 kJ/mol. E. The proton motive force drives ATP synthesis in mitochondria