In IgG,the antigen binding site is formed by
A)the variable segment of the light chain.
B)the variable segment of the heavy chain.
C)the constant segment of the heavy chain.
D)the variable segments of both the light and heavy chains.
E)the ionized segment of the light chain and the isotropic segment of the heavy chain.

Question

Quizplus · Accepted Answer

The antigen binding site in IgG is formed by the variable segments of both the light and heavy chains. These variable segments contain hypervariable regions that form the complementarity-determining regions (CDRs) which specifically bind to antigens. The constant segments of the heavy chain are responsible for structural stability of the antibody. The ionized segments of the light chain and the isotropic segment of the heavy chain do not play a role in antigen binding.

In IgG,the Antigen Binding Site Is Formed by