<span>NADH and FADH2 are part of the Calvin cyle, so A and B are incorrect. I'm not sure, but I think that cytochrome C to oxygen has to do with cell division. The correct answer is D, the electrons are passed from reduced ubiquinone (QH2) to cytochrome, C, one at a time.</span>
In eukaryotic cells, however, the two processes are separated in both space and time: mRNAs are synthesized in the nucleus, and proteins are later made in the cytoplasm.