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Biology: The Unity and Diversity o...
Biology: The Unity and Diversity o...
_____ are targets of cytotoxic T cells.
- a. Extracellular virus particles in blood
- b. Virus-infected body cells or tumor cells
- c. Parasitic worms in the liver
- d. Bacterial cells in pus
- e. Pollen grains in nasal mucus
Concept introduction: The cytotoxic T cell is a T lymphocyte that can kill cancer cells, the cells that are infected, or the cells that are damaged in any other ways. The cytotoxic T cells express T-cell receptors that can recognize a specific antigen.
Reason for correct answer:
The cell-mediated response targets the infected or cancerous body cells. The cancerous cells will display abnormal proteins on their cell surface, and the body infected with viruses displays polypeptides of the infecting agent. These cells are killed in a cell-mediated response, and the killers are the antigen-sensitized cytotoxic T cells.
Option b. is given as “Virus-infected body cells or tumor cells”. As the cytotoxic T cells target the virus-infected body cells or tumor cells, option b. is correct.
Reasons for incorrect answer:
Option a. is given as “Extracellular virus particles in blood”.
Antibody-mediated response acts against the extracellular virus particles in the blood. Therefore, option a. is incorrect answer.
Option c...
Chapter 37 Solutions
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