Describe the Q cycle in Complex III and its significance in proton pumping.

The Q cycle removes protons from the mitochondrial matrix without electron transfer.

The Q cycle acts as the final electron acceptor, forming water.

The Q cycle directly synthesizes ATP from ADP and inorganic phosphate.

The Q cycle involves the transfer of electrons from ubiquinone to cytochrome c, resulting in the pumping of 4 protons into the intermembrane space.