Iron-containing compounds are .......

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(D) Iron is a crucial component of several biological molecules involved in oxygen transport and electron transport. $1$. Hemoglobin is the protein in

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(D) Iron is a crucial component of several biological molecules involved in oxygen transport and electron transport. $1$. Hemoglobin is the protein in red blood cells that carries oxygen throughout the body and contains iron in its heme group. $2$. Myoglobin is a protein found in muscle tissues that stores oxygen and also contains an iron-based heme group. $3$. Cytochromes are iron-containing hemoproteins that act as electron carriers in the electron transport chain during cellular respiration. Therefore,all three compounds contain iron.

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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