Question

Antigen bind to this part of antibody
A) Paratope
B) Epitope
C) Fc fragment
D) Fab fragment

Answer 1

Hint:An antigen is any material that causes antibodies to be produced against it by your immune system. This means that the material is not accepted by the immune system and is attempting to fight it off. A material from the atmosphere, such as chemicals, bacteria , viruses, or pollen, can be an antigen. The inside of the body can also shape an antigen.

Complete answer:
A particular chemical interaction between antibodies formed by white blood cell B cells and antigens during an immune reaction is the antigen-antibody interaction, or antigen-antibody reaction. By a method called agglutination, the antigens and antibodies mix.
It is the basic reaction in the body by which complex foreign molecules such as pathogens and their chemical toxins are shielded from the body.In the blood, the antigens are directly bound by antibodies to form an antigen-antibody complex with a high affinity.
The immune complex is then transferred to cellular systems where it can be killed or deactivated. There are many kinds of antibodies and antigens, and each antibody can only bind to a particular antigen. The specificity of the binding is due to each antibody 's unique chemical constitution.In comparison to immunity developed at birth, which is innate immunity, when a person is exposed to antigens immunity is developed which is called adaptive or acquired immunity.
 The immunity acquired depends on the interaction of antigens with a group of proteins called antibodies formed by blood B cells. There are several antibodies and each of them is unique to a particular type of antigen.
 In acquired immunity, the immune response is thus due to the exact binding of antigens to the antibody.Via complementary binding sites, called antigen epitopes and antibody paratopes, only very small areas of the antigens and antibody molecules actually interact.

The correct Answer is option(A)Paratope.

Note:In laboratory techniques, antigen-antibody interaction is used to serologically assess the compatibility of blood and different pathogenic infections. ABO blood group determination, which is useful for blood transfusion, is the most simple. ELISA, enzyme-linked immunospot (Elispot), immunofluorescence, and immunoelectrophoresis are sophisticated applications.