The molecular fragment on an antigen molecule that a lymphocyte recognizes and responds to is called a/an
A)epitope.
B)hapten.
C)antigen binding site.
D)variable region.
E)None of the choices are correct.

Question

Quizplus · Accepted Answer

The molecular fragment on an antigen molecule that a lymphocyte recognizes and responds to is called an epitope. An epitope is the specific part of an antigen molecule that interacts with the immune system and triggers an immune response. Haptens are small molecules that cannot stimulate an immune response on their own but can bind to larger molecules to create a neoantigen. Antigen binding site and variable region are parts of antibodies.

The Molecular Fragment on an Antigen Molecule That a Lymphocyte