Question

The CD4+ T cells recognize antigenic peptides presented by?

Complement system
MHC I
MHC II
MHC III
Red blood cells surface proteins

Answer 1

CD4+ T cells recognize antigenic peptides presented by Major Histocompatibility Complex (MHC) II molecules on antigen-presenting cells (APCs).

Step-by-step explanation:

Antigens are processed and fragmented inside these APCs, and the antigen fragments are then presented on the surface of the APCs along with MHC II molecules. CD4+ T cells recognize antigenic peptides presented by Major Histocompatibility Complex (MHC) II molecules on antigen-presenting cells (APCs).

When a CD4+ T cell encounters an antigen-presenting cell with the appropriate antigen-MHC II complex, the T cell receptor on the CD4+ T cell recognizes and binds to the complex, initiating an immune response.