Question:

Antigen binding site in an antibody is found between

Updated On: Jul 27, 2022

two light chains
two heavy chains
one heavy and one light chain
either between two light chains or between one heavy and one light chain depending upon the nature of antigen

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The Correct Option is C

Solution and Explanation

A typical antibody monomer has four protein chains, ie, two indentical light $(L)$ chains and two identical heavy $(H)$ chains. The chains are joined by disulphide links and other bonds to form a $Y$-shaped structure. Both the heavy $(H)$ and light $(L)$ chains have variable regions at the ends of $Y$ arms. The variable region from one light chain $(L)$ and one heavy chain $(H)$ form one antigen binding site. Hence, each antibody has two antigen binding sites.

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Notes on Immune System

Concepts Used:

Immune System

It consists of tissues, cells, soluble molecules like antibodies and lymphoid organs. The WBC cells called the leucocytes have a significant role as they seek out to destroy the disease-causing organisms. These leucocytes are stored in different locations in the body including the spleen, bone marrow, and thymus. These organs are called as the lymphoid organs. The leucocytes are also present in the lymph nodes of the body.It is considered as the main lymphoid orga and. It produces all the blood cells including the lymphocytes. The thymus is an organ that is present near to the heart, beneath the breastbone.