Chemicals taking part in respiratory electron transport are
A
Flavin nucleotides
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B
FeS and CoQ
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C
Cytochromes
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D
All the above
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Solution
The correct option is C All the above The various components of electron transport system include- cytochrome c, ubiquinone, flavoprotein (FMN or FAD), iron-sulfur protein (Fe-S) and enzyme cytochrome oxidase which is intimately associated with cytochrome a and a3. These components are arranged in four kinds of complexes- complex I (NADH Dehydrogenase complex), complex II (Succinate dehydrogenase complex), complex III (Cytochrome bc1 complex) and complex IV (Cytochrome oxidase complex). There is a fifth complex, ATP synthase complex which is involved in ATP synthesis. These complexes are arranged in a definite sequence in the inner mitochondrial membrane.