The Major Histocompatibility Complex Directs the Production of Proteins Called

Question

The major histocompatibility complex directs the production of proteins called
A)class I.
B)class II.
C)class IV.
D)both class I and class II.
E)both class I and class IV.

Accepted Answer

The major histocompatibility complex (MHC) directs the production of both class I and class II proteins. Class I MHC proteins are found on the surface of most nucleated cells and present antigens from within the cell to cytotoxic T cells. Class II MHC proteins are found only on antigen-presenting cells such as macrophages, dendritic cells, and B cells, and present antigens from outside the cell to helper T cells. Class IV MHC proteins do not exist.