Question

In the electron transport system present in the inner mitochondrial membrane, complexes $I$ and $IV$ are respectively:

• A. $NADH$ dehydrogenase and $FADH_2$
• B. $FADH_2$ and $NADH$ dehydrogenase
• C. $NADH$ dehydrogenase and cytochromec oxidase complex
• D. $NADH$ dehydrogenase and $ATP$ synthase
• E. Cytochrome be $1$ complex and $NADH$ dehydrogenase

Answer 1

Answer: (C)

Four major respiratory enzyme complexes of electron transport chain are located in the inner mitochondrial membrane :
Complex $I$ ($NADH$ dehydrogenase), complex $II$ (succinate dehydrogenase), complex $III$ (cytochrome be,) and cytochrome $IV$ (cytochrome $c$ oxidase)
There is a fifth complex called $ATP$ synthase which is involved in $ATP$ synthesis.