Cytochromes are

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(D) Cytochromes are iron-containing hemoproteins that act as electron carriers in the electron transport chain.They contain a heme group,which is a $F

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$Fe^{++}$ containing with porphyrin pigment

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(D) Cytochromes are iron-containing hemoproteins that act as electron carriers in the electron transport chain.They contain a heme group,which is a $Fe$-containing porphyrin pigment.During the electron transport process,the iron atom in the cytochrome undergoes reversible oxidation and reduction between the $Fe^{3+}$ and $Fe^{2+}$ states $(Fe^{3+} + e^- 	o Fe^{2+})$.

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