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Cytotoxic T-Cell Activity Against Target Cells (Quiz 2)

Why do target cells trigger their own destruction? One of the functions of T-cells in the immune system is to attack and destroy infected cells. Target cells are cells that have been attacked by a virus. The target cells present molecular information on their membranes that allow the cytotoxic T cells to identify and destroy them. Target cells have been taken over by a virus and do not have a good chance of surviving for long in any event. By triggering their own death they are reducing the chance that other cells nearby will become infected.

View the animation below, then complete the quiz to test your knowledge of the concept.






1Cytotoxic T-cells attack
A)viruses.
B)bacteria.
C)cells that display foreign proteins on their surface.
D)cells that display normal proteins on their surface.
E)both A and B



2Cytotoxic T-cells produce _______ which creates holes in the cell membranes of target cells.
A)antibody
B)perforin
C)cytokinin
D)lysozyme
E)complement



3Cytotoxic 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.



4Cytotoxic T-cells interact with Class II major histocompatibility complex (MHC) proteins.
A)True
B)False



5When a virus infects a cell, some of the viral proteins are broken down into peptide fragments.
A)True
B)False







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