Question

To what does the TCR of a helper T cell bind?

a) MHC I
b) MHC II
c) CD4
d) CD8

Answer 1

The TCR of a helper T cell binds to antigens presented with MHC II molecules. This binding triggers immune responses, including the release of cytokines.

Step-by-step explanation:

The TCR (T cell receptor) of a helper T cell binds to antigens presented with MHC II (major histocompatibility complex II) molecules.

MHC II molecules are found on antigen-presenting cells (APCs) such as dendritic cells, macrophages, and B cells.

When the TCR binds to the MHC II-antigen complex, it triggers a series of immune responses, including the release of cytokines that help coordinate the immune response.