The iron-free compound of haemoglobin is:

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(B) Haemoglobin is a conjugated protein consisting of a protein part called $Globin$ and a prosthetic group called $Haem$.$Haem$ is an iron-containing

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Haematin

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(B) Haemoglobin is a conjugated protein consisting of a protein part called $Globin$ and a prosthetic group called $Haem$.$Haem$ is an iron-containing porphyrin ring.When the iron $(Fe^{2+})$ is removed from the $Haem$ group,the remaining porphyrin structure is known as $Haematin$ (or more specifically,the iron-free derivative is often referred to as $Protoporphyrin$ $IX$).Among the given options,$Globin$ is the protein component,while $Haematin$ represents the iron-containing or iron-derived pigment structure associated with the breakdown of haemoglobin.

Column $I$	Column $II$ $\&$ $III$
$I$. Erythrocytes	$D$. Enucleated,biconcave circular in shape; $N$. Transport of gases $O_2$ and $CO_2$.
$II$. Neutrophils	$A$. Spherical large cells,nucleus with many lobes; $O$. Phagocytic in function.
$III$. Lymphocytes	$C$. Spherical nucleus,agranular cytoplasm; $M$. Humoral and cell-mediated immunity.
$IV$. Thrombocytes	$B$. Cellular fragments small,oval shaped; $L$. Clotting of blood.

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