Across
- 4. a long, whip-like structure that helps a cell to move.
- 7. viruses protein coat
- 9. found in large numbers in the cytoplasm of living cells
- 11. viral DNA embedded in DNA
- 12. Dutch scientist who was the first to use the word "virus"
- 13. a virus that infects bacteria
- 15. infection host cell copes virus indefinitely
- 16. envelope made up of two to three layers: the interior cytoplasmic membrane and the cell wall
- 19. respiration the process of breaking down food to release its energy
- 20. viruses that contain RNA
Down
- 1. Viruses are _____ meaning that they are not composed go any cell parts
- 2. preparation of weakened or killed pathogens
- 3. Shortened version of ribonucleic acid
- 5. Cycle This type of viral reproduction does not immediately kill the host cell
- 6. fusion the division of a cell into two genetically identical cells binary fission
- 8. Viroids are much _____ than viruses
- 10. Stanley American scientist who was able to isolate crystals of the tobacco mosaic virus
- 14. an organism that lives on or in a host and causes harm to the host
- 17. Name of the second stage of the lytic cycle
- 18. Transcriptase an enzyme needed to make DNA from an RNA template