Ubiquinone Is One of Two Mobile Electron Carriers in the Electron-Transport

question 28

Multiple Choice

Ubiquinone is one of two mobile electron carriers in the electron-transport chain.Where does the additional pair of electrons reside in the reduced ubiquinone molecule?

• A)The electrons are added directly to the aromatic ring.
• B)The electrons are added to each of two ketone oxygens on the aromatic ring.
• C)The electrons are added to the hydrocarbon tail, which hides them inside the membrane bilayer.
• D)Both electrons, and one proton, are added to a single ketone oxygen bound to the aromatic ring.

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