A) Lipid
B) Glycoprotein
C) Metalloporphyrins
D) \[F{{e}^{++}}\]containing with porphyrin pigment
Correct Answer: D
Solution :
Cytochromes contain Fe with porphyrin pigment. The electrons pass through the cytochromes reducing their \[F{{e}^{+3}}\]into \[F{{e}^{+2}}\,\,(F{{e}^{+3}}+{{e}^{-}}\to F{{e}^{+2}})\].
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