In mitochondria,protons accumulate in the

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(C) During the process of cellular respiration,the electron transport system $(ETS)$ is located in the inner mitochondrial membrane. As electrons pass

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intermembrane space

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(C) During the process of cellular respiration,the electron transport system $(ETS)$ is located in the inner mitochondrial membrane. As electrons pass through the various complexes of the $ETS$,energy is released and used to pump protons ($H^+$ ions) from the mitochondrial matrix into the intermembrane space. This creates a proton gradient across the inner membrane,which is essential for the synthesis of $ATP$ by $ATP$ synthase.

Column $I$	Column $II$
$i.$ $FADH_2$	$a.$ Complex $III$
$ii.$ Ubiquinol	$b.$ Complex $IV$
$iii.$ $NADH + H^{+}$	$c.$ Complex $II$
$iv.$ Cytochrome $C$	$d.$ Complex $I$

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