Which one of the following statements about T cells involved in an immune response is NOT true?
A)Activated T cells receive survival signals from antigen during an infection.
B)Activated T cells contribute to the activation of antigen-presenting cells via CD40 ligand.
C)Memory T cells generated during a primary immune response express high levels of interleukin-2 receptors and actively proliferate long after the primary response is completed.
D)The major effector function of helper T cells is to activate macrophages and other cells by releasing cytokines.
E)When an infection is eliminated,activated T cells die by apoptosis.

Question

Quizplus · Accepted Answer

Memory T cells are not actively proliferating and do not express high levels of IL-2 receptors.Instead,these cells are functionally quiescent and are not performing effector functions after a primary immune response.Effector T cells continue to survive in the periphery via proliferative signals from MHC-antigen binding to the TCR.Effector helper T cells can then activate macrophages and other lymphocytes via release of cytokines such as IFN-F1F1F1S1F1F1F10,as well as through CD40 ligand on the cell surface.On elimination of the infection,the effector T cells die by apoptosis.

Which One of the Following Statements About T Cells Involved