Which statement is correct?
A) T cells recognize only antigenic fragments that are processed and presented in specific ways.
B) Exogenous antigens trigger production of abnormal MHC complexes.
C) Regulatory T cells enhance both innate and adaptive immune responses.
D) Helper T cells are killer cells.

Question

Quizplus · Accepted Answer

T cells can only recognize antigenic fragments that are processed and presented in a specific way by MHC molecules. This mechanism ensures that T cells do not attack healthy cells that are not presenting the appropriate antigen fragment-MHC complex.

Answer: B
 Exogenous antigens, which are antigens that come from outside the body (e.g. bacteria, viruses), trigger the production of normal MHC complexes. It is endogenous antigens, which are antigens that come from within the body (e.g. cancer cells), that can trigger the production of abnormal MHC complexes.

Answer: False, no letter corresponds to this statement. 
 Regulatory T cells suppress both innate and adaptive immune responses. They prevent excessive immune responses and help prevent autoimmune reactions.

Answer: False, no letter corresponds to this statement. 
 Helper T cells are not killer cells; they help activate and coordinate other immune cells, such as B cells and cytotoxic T cells, to eliminate the pathogen.

Which Statement Is Correct