Question

Maximum amount of iron is present in

• A. Myoglobin
• B. Cytochromes
• C. Haemoglobin
• D. Ferritin

Answer 1

The correct option is C Haemoglobin

Haemoglobin is a respiratory pigment present in the RBC of the blood. It is a oligoprotein which has four polypeptide chain, two alpha chain and two beta chain. It has a quaternary structure where each polypeptide has heme group with iron in the center. The polypeptide are linked together by the disulphide groups. The structure is stabilized by h-bonds. It is a chromoprotein because it has heme as a cofactor, which is iron containing pigment and makes the blood appear red. Each iron combines with a oxygen molecule.

Myoglobin is also a oxygen carrier in muscles but it has only one heme group while haemoglobin has four. So it has lesser iron content than haemoglobin.

Cytochromes are iron containing protein. It helps in the generation of ATP by electron transport chain. It helps in the transfer of electrons by oxidation and reduction. It has one heme group.

Ferritin is a blood cell protein that contains iron. The iron content is less than haemoglobin and the amount fluctuates depending upon the iron available for storage in the blood cells.

So, the correct answer is option C.