Question

Which of the following is expressed by antigen-presenting cells (APCs) and plays a role in the display of antigens for recognition by T cell receptors (TCRs)?

A. MHC class I
B. TLR
C. FcR
D. Antigen
E. CD4

Answer 1

Antigen-presenting cells (APCs) display antigens for recognition by T cell receptors (TCRs) on T cells. Naïve CD4+ T cells bind to MHC II molecules on APCs, while CD8+ T cells engage antigen-embedded MHC I molecules. Both types of T cells interact with APCs for immune protection.

Step-by-step explanation:

Antigen-presenting cells (APCs) play a crucial role in displaying antigens for recognition by T cell receptors (TCRs). APCs present antigens specifically for activating T cells. Naïve CD4+ T cells bind to APCs via MHC II molecules, while CD8+ T cells engage antigen-embedded MHC I molecules on APCs. Both types of T cells bind to MHC molecules via their TCRs for immune protection.