Ch 12 Crossword puzzle

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Across
  1. 3. Many bacteria also have ________ outside their cell walls.
  2. 5. A method in which a plasmid replicates and is transferred from one bacterium to another by the use of a pilus
  3. 8. A substance that causes disease
  4. 9. Microscopic organisms
  5. 10. The most common form of reproduction in bacteria, which is asexual
  6. 12. Protein contained in the cell walls of bacteria
  7. 14. Infectious particles made of a short, circular strand of RNA
  8. 15. Prokaryotes that can act as decomposers in extreme environments
  9. 17. A virus which claimed the lives of many people in Africa
  10. 18. A carrier of genetic information
  11. 19. Viruses that can force a cell to transcribe its RNA into the cell's DNA
  12. 20. Infectious particles made only of abnormal proteins
Down
  1. 1. Bacteria that get their energy from dead and decaying matter
  2. 2. A virus that infects bacteria
  3. 4. A process in which a virus infects a cell but does not destroy it.
  4. 6. ______________ occurs when a bacterium takes in a piece of bacterial DNA that is floating free in the environment.
  5. 7. The DNA region of bacteria
  6. 11. The poliovirus is __________
  7. 13. The transfer of genetic information from one bacterium to another
  8. 16. A protein described in 1957