Nature of Viruses

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Across
  1. 2. Mutation rate is high in viruses because RNA replicases have no ------------ ability
  2. 3. +ssRNA used for translation to -------- for virion assembly
  3. 4. Basic capsid shape of most animal viruses
  4. 7. Difficult to trace phylogeny as virus ------ ---- is limited (2 words)
  5. 11. Viral capsids come in --- fundamental shapes
  6. 13. Infectious naked circular RNA molecules
  7. 14. BC class of dsDNA viruses. some parts single-stranded. Replication: DNA genome → +ssRNA → dsDNA by reverse transcription
  8. 16. +ssRNA used as new ------- for virus production
  9. 17. When prions convert proteins to prions these aggregate into ------- and -------
  10. 21. Type of capsid with 20 equilateral triangular faces & most efficient subunit arrangement (max. internal capacity)
  11. 22. Complex viruses have ----- symmetry = neither completely helical nor icosahedral
  12. 23. Names of systematic groups used to classify viruses in descending order from highest to lowest taxon
  13. 26. BC class of dsRNA virus → RNA replicases transcribe 1 strand to mRNA for translation
  14. 30. Viruses lack ---------
  15. 33. Viral genomes do not code for proteins for ---------- and -----------
  16. 34. Cell or organism types a virus can infect (2 words)
  17. 35. Viruses generally lack a ----------
  18. 36. A capsid that is tightly associated with the viral genome
  19. 37. Giant virus which was originally misidentified as a bacterium
Down
  1. 1. Naked viruses lack a ----- (2 words)
  2. 5. Type of capsid found in TMV (rod-like/thread-like)
  3. 6. BC class of +ssRNA viruses which are transcribed to many -ssRNA & +ssRNA copies in cell
  4. 8. --------- viruses have greater morphological diversity than naked viruses
  5. 9. --------- classification classifies viruses by genome replication & expression strategies
  6. 10. Enzymes which convert RNA genome to RNA strand of opposite polarity or orientation (2 words)
  7. 12. BC class of dsDNA virus → mRNA with host machinery
  8. 15. Genes which are expressed first after virus enters host cell, allowing it to take over host cell expression machinery
  9. 18. Host cells cannot produce RNA from ---
  10. 19. No. of conventional systematic groups used to classify viruses
  11. 20. Viruses are --- --- parasites (2 words)
  12. 24. Viruses lack ---
  13. 25. Subset of cells targeted by virus (2 words)
  14. 27. Giant viruses possess genes for ---
  15. 28. +ssRNA viruses (BC group VI) which must be converted to dsDNA by reverse transcription
  16. 29. BC class of +ssDNA virus → dsDNA with own enzymes → mRNA with host
  17. 31. Misfolded versions of normal proteins that are very resistant to degradation
  18. 32. Viruses cannot --------- on their own