In the electron transport system present in the inner mitochondrial membrane, complexes I and IV are respectively
A
NADH dehydrogenase and FADH2
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B
FADH2 and NADH dehydrogenase
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C
NADH dehydrogenase and cytochrome oxidase complex
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D
NADH dehydrogenase and ATP synthase
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E
Cytochrome complex and NADH dehydrogenase
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Solution
The correct option is D NADH dehydrogenase and cytochrome oxidase complex An electron transport chain is a series of compounds that transfer electrons from electron donors to electron acceptors via redox reactions and couples this electron transfer with the transfer of protons across a membrane. This creates an electrochemical proton gradient that drives ATP synthesis or the generation of chemical energy in the form of ATP. Final acceptor of electrons transport chain is molecular oxygen. Complex I is NADH dehydrogenase and complex IV is cytochrome oxidase complex.