Chapter 21

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Across
  1. 2. — Laboratory staining technique used to classify bacteria.
  2. 6. — Process of becoming protected against a disease.
  3. 8. — Virus that uses RNA as its genetic material.
  4. 10. — Transmission pathway through contaminated food or water.
  5. 12. — Tick that carries and transmits infectious disease organisms.
  6. 14. — Blood testing method that detects antibodies or antigens.
  7. 15. — RNA virus that causes hepatitis A infection.
Down
  1. 1. — Biological preparation that helps the body develop immunity.
  2. 3. — Airways that carry air into the lungs.
  3. 4. — Immune cells that destroy infected or abnormal cells.
  4. 5. — Chemical released during allergic reactions causing inflammation.
  5. 7. — Cell surface protein involved in immune recognition.
  6. 9. — Inflammation of the liver.
  7. 11. — Technique used to amplify and detect DNA or RNA.
  8. 13. — Complete genetic material of an organism.