Which of the following statements is true?
(a) Ubiquinone is a small, hydrophobic protein containing a metal group that acts as an electron carrier.
(b) A 2Fe2S iron-sulfur center carries one electron, whereas a 4Fe4S center carries two.
(c) Iron-sulfur centers generally have a higher redox potential than do cytochromes.
(d) Mitochondrial electron carriers with the highest redox potential generally contain copper ions and/or heme groups.
Answer:
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