TF Viro.txt

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Author:
kackerson
ID:
67993
Filename:
TF Viro.txt
Updated:
2011-02-21 21:03:01
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Viro
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Description:
Viro Midterm
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  1. 1. A Virus is a cell composed of genetic material.
    F- NOT A CELL!
  2. 2. Viruses are obligate intracellular parasites.
    T
  3. 3. All viruses possess both DNA and RNA.
    F Either one or the other
  4. 4. Viruses are extracellular.
    T- they must be intracellular to replicate only.
  5. 5. Virus envelopes are derived from viral proteins.
    F- host cell proteins
  6. 6. All viruses have envelopes.
    F
  7. 7. Virion and virus is interchangeable.
    T
  8. 8. Empty capsids are able to replicate.
    F. They are incomplete and are without chromosomes. The more inefficient a virus (more empty capsids) the more mild the virus is.
  9. 9. Pseudovirions are infectious.
    F, Pseudotypes are infectious.
  10. 10. The majority of viruses multiply in the nucleus.
    F- in the cytoplasm.
  11. 11. All viruses have a single capsid.
    F- All BUT Reoviridae.
  12. 12. Capsomeres are solid in reo and herpes viruses but hollow in others.
    F- hollow in herpes in reo and solid in others.
  13. 13. Every helical virus that causes disease in an animal has an envelope.
    T
  14. 14. All viruses carry their own enzymes.
    F- Not all but some.
  15. 15. Naked viruses tend to be more stable in the environment than enveloped viruses.
    T
  16. 16. DNA viruses can never undergo genetic reassortment.
    T- Only a few RNA viruses.
  17. 17. Retro virus is the exception to negative sense RNA viruses.
    F, + sense. Although it is + it is not immediately infectious.
  18. 18. Acidic conditions lead only to irreversible disassembly of the viral capsid.
    F- reversible or irreversible.
  19. 19. There are more DNA viruses than RNA viruses.
    F- Opposite.
  20. 20. All viruses have inclusion bodies.
    F
  21. 21. All pox viruses cause skin lesions and are oncogenic.
    F- not all are oncogenic.
  22. 22. Only enveloped poxviruses are infectious.
    F- Both enveloped and naked.
  23. 23. Monolayer plaque assays show colored necrotic plaques.
    F, colorless
  24. 24. Capsids and chromosomes are generated separately.
    T
  25. 25. Enveloped viruses are released by budding.
    T
  26. 26. Only Naked viruses kill the cell.
    F Some enveloped viruses do as well.
  27. 27. Most enveloped viruses get their membrane from the plasma cell membrane.
    T Herpes gets it from the nuclear membrane. Some get them from the ER or Golgi, etc.
  28. 28. Latent viruses are active infections waiting to lyse cells and cause disease.
    F- INACTIVE
  29. 29. If a cell is not infected by a particular virus, you will not see inclusion bodies.
    T
  30. 30. All nonenveloped naked animal viruses are helical.
    F- icosahedral
  31. 31. Only helical mammalian viruses are enveloped.
    F- some icosahedral viruses are also enveloped.
  32. 32. Naked viruses lyse the cells they inhabit.
    T
  33. 33. Enveloped viruses bud from cell membranes.
    T
  34. 34. Cell lysis is a more efficient mechanism of viral release.
    F- Budding is more efficient

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