Question

2. Define antigen and give an example of the same

Write some points.​

Answer 1

Answer:

An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off.

An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen. An antigen may also form inside the body.

Answer 2

A N S W E R :

Defination :-

Antigens can simply be defined as substance which when, introduced into the body, stimulate the production of antibodies.

Example :-

Some substance produced by some viruses and bacteria.

E X T R A I N F O R M A T I O N :-

• Antigens consist of proteins, polysaccharides or nucleic acids.

• Antigens determinants or epitopes are the components of antigens.

• Each antigen carries many epitopes.

• Antigens are of two types, namely - Complete antigens and Incomplete antigens.

• Incomplete antigens are also known as partial antigens or " Haptens ".

• The antigens which are present are the body's own cells are called " Self antigens ".

• Self antigens are also known as " Autoantigens ".

• The antigens on the non - self cells are called " Foreign antigens ".

• Foreign antigens are also known as " Nonself antigens ".