Multiple Choice
Tc cells recognize epitopes only when the latter are held by
20. Adaptive Immunity
Functions of T Lymphocytes
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Which statement is FALSE about cytotoxic T cells?
A
They stimulate B cells.
B
They destroy virus-infected cells.
C
They recognize MHC I bound antigens on APCs.
D
They induce apoptosis in infected cells.
Verified step by step guidance1
Understand the role of cytotoxic T cells (also known as CD8+ T cells) in the immune system. They are primarily responsible for killing infected cells and cancer cells.
Recall that cytotoxic T cells recognize antigens presented by MHC class I molecules, which are found on all nucleated cells, including virus-infected cells.
Cytotoxic T cells induce apoptosis, a programmed cell death, in cells that are infected or have become cancerous, thereby preventing the spread of infection or cancer.
Consider the role of B cells in the immune system. B cells are responsible for producing antibodies and are activated by helper T cells (CD4+ T cells), not cytotoxic T cells.
Evaluate the statements given in the problem. The statement 'They stimulate B cells' is false because cytotoxic T cells do not have a role in directly stimulating B cells; this is the function of helper T cells.
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