Question

All of the following accurately describe the adaptive immune system EXCEPT:

a. Tc (cytoxic T cells; CD8+ T) cells can be activated by antigen in the context of MHC I molecules
b. Exogenous antigens (antigens present in the ECF) are presented on MHC II molecules.
c. Endogenous antigens (antigens inside body cells) are presented on MHC I molecules.
d. Th (helper T cells; CD4+ T) cells can be activated by antigen in the context of MHC II molecules.
e. All of the above are correct.

Answer 1

All the provided statements correctly describe the interactions involving T cells, antigens, and MHC molecules in the adaptive immune system.

Step-by-step explanation:

The statement that accurately describes the adaptive immune system is:

• Tc (cytotoxic T cells; CD8+ T) cells can be activated by antigen in the context of MHC I molecules.
• Exogenous antigens (antigens present in the ECF) are presented on MHC II molecules.
• Endogenous antigens (antigens inside body cells) are presented on MHC I molecules.
• Th (helper T cells; CD4+ T) cells can be activated by antigen in the context of MHC II molecules.

Therefore, the statement e. "All of the above are correct" is indeed accurate. Each point reflects the interactions between T cells, antigens, and MHC molecules as understood in adaptive immunity.