What is an antibody and antigen?

Answer 1

Antigens are substances that provoke an immune response (they're the ultimate target for the immune system). Antibodies are simply proteins that are secreted as a result of the antigen provoked immune response. In short, antigens cause the disease and antibodies cure it.

Answer 2

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Let's start with pathogen. A pathogen is any organism capable of producing disease.

An antigen refers to the protein on the surface of a cell (bacterium, fungus or virus) that our bodies recognize as a foreign substance and triggers the immune system into producing antibodies specific to that antigen. This means that if in the future the same antigen is again introduced, our immune system will recognize, remember and produce the right antibodies to "deal" with the intruders.

Now it's easier to see the relationship between the two. Pathogens have antigens on their surface. The relationship also explains the difference.

▬ Brittany ▬

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Answer 3

An antigen is a substance/molecule that, when introduced into the body, triggers the production of an antibody by the immune system, which will then kill or neutralize the antigen that is recognized as a foreign and potentially harmful invader. These invaders can be molecules such as pollen or cells such as bacteria. The term originally came from antibody generator.

Answer 4

An antibody is a glycoprotein that is produced by plasma cells. It consists of heavy chains and light chains.

An antigen is a molecule that interacts with an antibody (or T-Cell). When the antigen interaction induces an immune response it is known as an immunogen.

Answer 5

Antigen is a substance that when introduced into the body stimulates the production of an antibody. Antigens include toxins, bacteria, foreign blood cells, and the cells of transplanted organs.

Agglutinogens are

1. any substance that, acting as an antigen, stimulates the production of agglutinin.

2. the particulate antigen used in conducting agglutination tests.