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(C) The electron transport system $(ETS)$ in the inner mitochondrial membrane consists of four major protein complexes involved in the transfer of ele

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$4$

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(C) The electron transport system $(ETS)$ in the inner mitochondrial membrane consists of four major protein complexes involved in the transfer of electrons: $1$. Complex-$I$ ($NADH$ dehydrogenase)$2$. Complex-$II$ (Succinate dehydrogenase)$3$. Complex-$III$ (Cytochrome $bc_1$ complex)$4$. Complex-$IV$ (Cytochrome $c$ oxidase)Although $ATP$ synthase is often referred to as Complex-$V$,it is involved in oxidative phosphorylation ($ATP$ synthesis) rather than the electron transport chain itself. Therefore,$4$ complexes are primarily involved in the electron transport process.

Column-$I$ ($ETS$ Complex)	Column-$II$ (Name of Complex)
$P$. Complex-$I$	$I$. Cytochrome $c$ oxidase complex
$Q$. Complex-$II$	$II$. Cytochrome $bc_1$ complex
$R$. Complex-$III$	$III$. $ATP$ synthase complex
$S$. Complex-$IV$	$IV$. $FADH_2$ dehydrogenase complex
$T$. Complex-$V$	$V$. $NADH$ dehydrogenase complex

How many complexes are involved in the electron transport system $(ETS)$ in mitochondria?

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