<prompt> Which of the following is the role of coenzyme Q ubiquinone in the respiratory chain?It links flavoproteins to cytochrome b, the cytochrome of lowest redox potentialIt links NAD-dependerit dehydrogenases to cytochrome bIt links each of the cytochromes in the respiratory chain to one anotherIt is the first step in the respiratory chain  <response>: Coenzyme Q collects reducing equivalents from flavoprotein complexes and passes them along the chain to the cytochromes. Reducing equivalents from a number of substrates are passed through coenzyme Q in the respiratory chain. 