Question

Substances known as _________ provoke a specific immune response so discriminating that only a single molecular fragment, called an __________, actually interacts with the lymphocyte’s receptor.

Answer 1

Answer:

Antigens, and epitopes.

Explanation:

Antigen is known as a substances which is capable of the causes an immune response in the body, and specifically activating white blood cells which are known as body's infection fighting cells. In general antigens are two types:

1) Foreign antigens or heteroantigens.

2) Auto-antigens or self antigens.

Epitopes are the part of an antigen which is recognized with the help of immune system, specifically by B cells, T cells, and antibodies. They are also called as antigenic determinants. The epitope is defined as the specific part of the antigen where an antibody binds.

Answer 2

Answer:

Antigens; epitope.

Explanation:

The immune system of the body is important as it helps to fight against with the harmful pathogens that cause disease in the organism. This also helps in self tolerance of the organism.

The antigens are known to be pathogenic in humans and specific antibodies are created in the body to kill the antigen. The part of the antigen that can cause cause disease and evokes the immune response of the host is known epitope and the other part is known as epitope.

Thus, the answer is antigens; epitope.