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Question

(C) An antibody molecule is $Y-$shaped and consists of four polypeptide chains: two identical heavy $(H)$ chains and two identical light $(L)$ chains.

Vedclass · Accepted Answer

one heavy and one light chain

Vedclass · Answer

(C) An antibody molecule is $Y-$shaped and consists of four polypeptide chains: two identical heavy $(H)$ chains and two identical light $(L)$ chains. The antigen-binding site,also known as the paratope,is located at the variable region of the antibody. This site is formed by the interaction between the variable domain of one heavy chain $(V_H)$ and the variable domain of one light chain $(V_L)$. Therefore,the antigen-binding site is found between one heavy and one light chain.

Column-$I$	Column-$II$
$(a)$ Physical barrier	$(w)$ Saliva
$(b)$ Physiological barrier	$(x)$ Interferons
$(c)$ Cellular barrier	$(y)$ Skin
$(d)$ Cytokine barrier	$(z)$ Monocytes

The antigen-binding site in an antibody is found between:

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