Which type of cell is responsible for causing apoptosis in cancer cells and virus-infected cells?

• A. Dendritic cells
• B. Helper T cells
• C. Plasma cells
• D. None of the listed responses is correct.
• E. Natural killer cells

Answer: (E)

Verified step by step guidance

1. Understand the concept of apoptosis: Apoptosis is a form of programmed cell death that is crucial for maintaining healthy tissue homeostasis and eliminating harmful cells, such as cancerous or virus-infected cells.
2. Identify the role of natural killer (NK) cells: NK cells are a type of lymphocyte in the immune system that can recognize and induce apoptosis in cells that are stressed, such as cancer cells or cells infected with viruses.
3. Differentiate between the cell types listed: Dendritic cells are antigen-presenting cells that help initiate the immune response. Helper T cells assist other cells in the immune response. Plasma cells are responsible for producing antibodies. None of these directly induce apoptosis in cancer or virus-infected cells.
4. Recognize the unique function of NK cells: Unlike the other cell types listed, NK cells have the ability to directly target and kill cells without prior sensitization, making them effective in inducing apoptosis in abnormal cells.
5. Conclude that natural killer cells are the correct answer: Based on their function and role in the immune system, NK cells are responsible for causing apoptosis in cancer cells and virus-infected cells.