Which Cells Become Activated Only If the Antigen Appears in the Body

Question

Which cells become activated only if the antigen appears in the body at a later date?
A) helper T cells
B) regulatory cells
C) macrophages
D) memory B cells
E) cytotoxic T cells

Accepted Answer

Memory B cells become activated only if the antigen appears in the body at a later date. These cells are responsible for maintaining immunological memory, which allows the immune system to respond more quickly and effectively to a pathogen if it is encountered again in the future. Helper T cells, regulatory cells, macrophages, and cytotoxic T cells can also play important roles in the immune response, but do not specifically become activated only in response to a previously encountered antigen.