Cytotoxic T-cells interact with target cells by recognizing
A) foreign proteins only.
B) MHC proteins only.
C) foreign protein-MHC protein complexes.
D) either foreign proteins or MHC proteins.
E) neither foreign proteins nor MHC proteins.

Question

Quizplus · Accepted Answer

Cytotoxic T-cells (also known as CD8+ T cells) interact with target cells by recognizing foreign protein-MHC protein complexes. MHC proteins are molecules found on the surface of cells that enable the immune system to differentiate self from non-self cells. When a cell becomes infected with a virus, it presents fragments of the virus's proteins on its surface using MHC proteins. Cytotoxic T-cells can then recognize these foreign protein-MHC protein complexes and initiate an immune response to destroy the infected cells. Therefore, option C is the correct choice.

Cytotoxic T-Cells Interact with Target Cells by Recognizing