試題詳解

39. How do T cell receptor recognize antigen?
(A) Antigen receptors of T cell bind to antigens on the surface of a virus.
(B) the antigen receptors on the surface of the helper T cell bind to antigen fragments complex with class-I MHC molecules on the antigen-presenting cell.
(C)accessory protein CD8 on the helper T cell surface binds to the MHC molecules, helping keep the cell-cells joined.
(D) an antigen fragment binds to an MHC molecule and then displayed to the cell surface. The combination of MHC molecule and antigen is recognized by T cell.
(E)None of the above.