In a scenario where ubiquinone is reduced, what is the significance of the Q cycle in Complex III?

• A. The Q cycle facilitates electron transfer from ubiquinone to cytochrome c, resulting in proton pumping into the intermembrane space.
• B. The Q cycle removes protons from the mitochondrial matrix without electron transfer.
• C. The Q cycle acts as the final electron acceptor, forming water.
• D. The Q cycle directly synthesizes ATP from ADP and inorganic phosphate.

Answer: (A)