Question

The Q cycle

A) allows for the movement of protons without additional electrons.
B) is associated with complex I.
C) mediates the transfer of electrons to oxygen.
D) accounts for the generation of superoxide.
E) all of the above

Answer 1

C) mediates the transfer of electrons to oxygen. The Q cycle is part of mitochondrial oxidative phosphorylation, specifically associated with complex III. It facilitates electron transfer and proton pumping b

Step-by-step explanation:

The question pertains to the Q cycle, which is involved in the transfer of electrons through the electron transport chain in mitochondrial oxidative phosphorylation. Specifically, the Q cycle is associated with complex III, not complex I, and it is responsible for transferring electrons from ubiquinone (coenzyme Q) to cytochrome c while pumping protons across the inner mitochondrial membrane to facilitate the generation of ATP.

As such, the correct answer to this question is that the Q cycle mediates the transfer of electrons to oxygen indirectly via cytochrome c (option C). It does allow for the movement of protons but it is incorrect to state without additional electrons, as the movement of protons is directly linked to the transfer of electrons within the mitochondrial electron transport chain.