Question 1 1 pts Which of the following compounds is not involved in a reaction that involves a transfer of electrons? ATP/ADP NAD+/NADH Iron Sulphur clusters FAD/FADH2 Question 2 1 pts Which statement does NOT describe an early role for proton gradients? They could have facilitated the reduction of CO2 They facilitated the removal of electrons from hydrogen through iron sulphurs clusters They formed at the interface of alkaline hydrothermal vents They arose because the ocean pH was more alkaline compared to the pH of the vent