Biology Edexcel A A-level topic 6 p4 infection and the immune system

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Across
  1. 6. A type of lymphocyte which matures in the bone marrow and produces antibodies.
  2. 7. The initial response produced by the immune system when it encounters a pathogen for the first time.
  3. 9. Loops of DNA found in the cytoplasm of prokaryotic cells.
  4. 10. A type of cell that does not contain any membrane bound organelles or a nucleus.
  5. 11. A non-living microorganism that consists of genetic material surrounded by a protein husk.
Down
  1. 1. A group of typically harmless microorganisms which are found on the surface of the skin and provide protection from harmful pathogens by competing with them for nutrients.
  2. 2. A type of T lymphocyte which regulates the immune response through the release of cytokines.
  3. 3. A type of T lymphocyte which triggers apoptosis in cells which are damaged or infected with viruses.
  4. 4. The response produced by the immune system to a pathogen which it has encountered previously.
  5. 5. A type of T lymphocyte with different subtypes found in different parts of the body which is used to provide long term immunity to a pathogen.
  6. 8. A type of lymphocyte that matures in the thymus and is involved in cell mediated immunity.