Question

The prosthetic group of haemoglobin is:
A. Porphin
B. Globulin
C. Heme
D.Gelatin

Answer 1

Hint:A protein present in red blood cell that transport oxygen to all tissues and organs and also transports back \[{\rm{C}}{{\rm{O}}_{\rm{2}}}\] from tissues and organs is termed haemoglobin. Its structure is composed of four molecules of proteins called globular chains and all are connected together.

Complete step by step answer:
In adults, the structure of haemoglobin is composed of two units each of alpha and beta polypeptide chains. And there is the attachment of each polypeptide chain to a prosthetic group.
Alpha subunit: This unit of haemoglobin is composed of an alpha polypeptide chain that contains 141 numbers of amino acid residues.
Beta subunit: This unit of haemoglobin is composed of a beta polypeptide chain that contains 146 numbers of amino acid residues.
Heme Group - This group is composed of iron molecules possessing a prosthetic group, which is in attachment to each chain of the polypeptide. The position of iron is in centre of the heme group.
Therefore, Haemoglobin's prosthetic group is the Heme group.

Hence, option C is right.

Additional Information:
There are many diseases that happen because of haemoglobin deficiency. The haemoglobin deficiency results in the decrease of the blood's capacity to carry blood. The deficiency of haemoglobin is due to poor nutrition, kidney failure, genetic defects, etc.

Note:In normal adults, two types of globin chains are present such as alpha globin and beta globin. But in the case of infants, the presence of the beta-globin chain is not visible. So, in infants, haemoglobin is made of two gamma and alpha chains.