Question

please explain the difference between antibody, antigen and immunity.

Answer 1

ANTIGEN

• Antigen are molecules which is responsible to produce immune respone in the body.
• It produces antibodies in our body if any immune response occurs.
• Antigen are proteins, nucleic acids, lipids or may be polysaccharides.
• They are found within the body or externally.
• The binding site of an antigen is an epitope, which is a specified space in which the antibody fits.

ANTIBODY

• Antibodies are protein molecules which recognize and binds to that specific antigen.
• They are found within the body.
• The binding site of an antibody is a paratope, which is a specific space in which the antigen binds.

IMMUNITY

• Immunity is the ability of our body to resist against harmful micro-organisms which is responsible for developing many diseases.
• When an antigen comes and binds with an antibody then an immune response occur within the body thereby preventing the occurrence of disease.
• There are natural as well as artificial immunity.
• Natural immunity gets by birth itself and it is the immunity within the person which helps to resist against many diseases.
• Artificial immunity gets when an external substance is introduced into the body. For eg. BCG vaccine gjves life long immunity against tuberculosis.

Note: Antigen and antibody reaction plays a vital role in protecting our body against many diseases by producing immune response and thereby maintaining the immunity of our body.