Which statement is true about T cells?
A) They will develop into cytotoxic T cells if antigen is complexed with class II MHC proteins.
B) Once activated, they cannot secrete cytokines.
C) Their proliferation is enhanced by interleukins 1 and 2.
D) They usually directly recognize antigens, which then activates a subpopulation of killer cells.

Question

Quizplus · Accepted Answer

T cell proliferation is enhanced by interleukins 1 and 2, among other cytokines.

Answer: A 
 The activation of cytotoxic T cells requires antigen to be complexed with class I MHC proteins, not class II.

Answer: D 
 T cells recognize antigens through their T cell receptors, but they do not directly activate killer cells. Instead, they can differentiate into killer T cells (cytotoxic T cells) which can then kill the target cells.

Answer: B 
 Once activated, T cells are capable of secreting cytokines like interleukin 2 and interferon gamma, which play important roles in immune responses. Therefore, this statement is false.

Which Statement Is True About T Cells