Respiratory complex III, the cytochrome bc1 complex, transfers electrons from ubiquinol to cytochrome c. Its Q-cycle mechanism separates the two electrons from a quinol and couples their transfer to vectorial proton movement.
Cytochrome c carries one electron at a time, whereas ubiquinol carries two. The mechanism therefore connects carriers with different electron stoichiometries while contributing to the membrane electrochemical gradient.

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  1. Mitochondrial respiratory chain
  2. Electron transport chain
  3. Energy metabolism
  4. Biochemistry
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