C. Electron transferred to ubiquinone, reoxidizing irons of iron-sulfur clusters. D. Q reduced to QH 2 . 1. Q accepts electrons by two one-electron transfers via the Q Cycle. Electrons are transferred to iron-sulfur cluster of cytochrome reductase one at a time. H. Cytochrome c donates electrons one at a time to cytochrome oxidase.
Cytochrome oxidase consists of two cytochromes and two copper atoms.
Four electrons are collected and then transferred to O 2 in a complicated mechanism. Down the Oxidation-Reduction Pathway. Most active in liver and some other mammalian tissues. No loss of potential ATP production. C. Glycerol phosphate shuttle.