Chapter 21 Key Terms

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Across
  1. 3. any agent that causes disease
  2. 7. particles that are composed of proteins & have no nucleic acids
  3. 8. virus protein coat
  4. 9. viruses that infect bacteria & have a complicated structure
  5. 13. oxygen free
  6. 15. bacteria that has shorter, thicker cut growths; enable bacteria to attach to surfaces or to other cells
  7. 16. gel-like layer outside the cell wall & membrane of bacteria
  8. 17. poisonous chemicals
  9. 18. a spiral cell
Down
  1. 1. a round shaped cell
  2. 2. thick-walled bacteria around their chromosomes & a small bit of cytoplasm when exposed to harsh conditions
  3. 4. proteins w/ attached carbohydrate molecules that are derived from the host cell
  4. 5. a single strand of RNA that has no capsid
  5. 6. a process in which 2 or more organisms exchange genetic material
  6. 10. chemicals that interfere w/ life processes in bacteria
  7. 11. membrane surrounding the capsid
  8. 12. segments of nucleic acids contained in a protein coat
  9. 13. live in the presence of oxygen
  10. 14. a rod shaped cell
  11. 15. viral gene that is inserted into the host chromosome