What is the smallest unit of an antigen that is capable of binding with an antibody?
A) MHC class I
B) An epitope
C) A paratope
D) MHC class II

Question

Quizplus · Accepted Answer

An epitope, also known as an antigenic determinant, is the smallest unit of an antigen that can bind to an antibody. An antibody is a Y-shaped protein molecule made by the immune system to recognize and bind specific epitopes on antigens. MHC class I and II molecules are involved in presenting epitopes to T cells, but they are not themselves the smallest unit of an antigen that can bind to an antibody. A paratope is the part of an antibody that binds to an epitope.

What Is the Smallest Unit of an Antigen That Is