The portions of an antigen's exposed surfaces to which its specific antibody binds are regions called
A) opsonins.
B) the constant segments of the light and heavy chains.
C) antigenic-determinant sites.
D) complement-binding sites.
E) antigen-binding sites.

Question

Quizplus · Accepted Answer

Antigenic-determinant sites, also known as epitopes, are the specific parts of an antigen's surface where the antibody binds. These sites are recognized by the immune system and are crucial for the specificity of the immune response.

The Portions of an Antigen's Exposed Surfaces to Which Its