Which of the following statements about cytochrome c is true?
(a) Cytochrome c shuttles electrons between the NADH dehydrogenase complex and cytochrome c reductase complex.
(b) When cytochrome c becomes reduced, two cysteines (sulfur-containing amino acids) become covalently bound to a heme group.
(c) The pair of electrons accepted by cytochrome c are added to the porphyrin ring of the bound heme group.
(d) Cytochrome c is the last protein in the electron-transport chain, passing its electrons directly to molecular oxygen, a process that reduces O2 to H2O.
Answer:
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