Immune System

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Across
  1. 2. these can help build up our bodies recognize a pathogen
  2. 3. These kill bacteria but not viruses.
  3. 5. Viruses come in many different ______.
  4. 7. smallest microbe that can make us sick
  5. 10. type of immunity we are born with
  6. 12. these blood cells help fight infection
  7. 14. bacteria are _____.
  8. 15. the name for the "invaders" that make us sick
Down
  1. 1. Most bacteria are not ______.
  2. 3. proteins that help fight off antigens
  3. 4. Virus's DNA or RNA is inside this.
  4. 6. This system protects us against disease.
  5. 8. Bacteria are _______-celled organisms.
  6. 9. viruses and bacteria that make us sick
  7. 11. scientists believe viruses are not _____.
  8. 13. A virus ______ a cell's machinery to make copies of itself.