Card Set Information

2013-02-22 14:17:38

Show Answers:

  1. who termed the word virus
    louis pasteur
  2. chracteristics of viruses
    • they can not exist independently
    • canm not not multiply unless they invade a host
    • are not cells
  3. what does a virues look like?
    it has a capsid, envelope ,a core and nucleic acid
  4. capsid
    made of individual subunits called capsomeres
  5. envelope
    surrounds capsid in 13 of 20 families
  6. naked virus
    a virus witout a envelope
  7. core
    carry dna or rna not both
  8. nucleocapsid
    nucleic acid and capsule together
  9. virion
    fully form virus that is able to establish an infection in a host
  10. what is the job of the capsid/envelope
    • to protect the nucleic acid
    • help introduce the viral dna or rna
    • stimulate the immmune system to produce antibodies that can protect the host cell against future infection
  11. nucleic acid
    contains genome- dna or rna
  12. genome
    the sum total of genectic information carried by an organism
  13. dna strands
    usually double
  14. rna strands
    usually single
  15. virus entry
    • absorption
    • penetration
    • uncoating
    • synthesis
    • assembly
    • release
  16. host range
    • spectrum of hosts or specific host cells that the virus can infect
    • viruses have limited host range
  17. receptor sites
    virues can only attach to
  18. absorption
    absorbs to recepter sites on the cell membrane
  19. penetration
    virus gets pentrated into the cell membrane
  20. uncoating
    enzymes in the vacuole dissolve the envelope and capsid then virusĀ  become coded
  21. synthesis
    the viral nucleic acid has control over the host synthetic and metabolic machinery
  22. assemble
    mature virus particles are constructed from the pool of parts
  23. release
    non enveloped virues are released when cell lysis or rupture
  24. endocytosis
    entire virus is engulfed by the cell and enclosed in a vacuole
  25. fusion
    viral envelope can also direct;y fuse with host cell aand only the capsid get inside
  26. cytopathic effect
    virus induced damage to the cell that alerts its appearance
  27. syncytia
    multinucleated giant cells
  28. persisitent infection
    slow release of virus particles , host replication can keep up with the cell death
  29. latent infection
    no immediate production of viral progenacy
  30. transformation
    virus eneters the cell and permantly alters its genectic material
  31. oncovirus
    virus capable of causing cance
  32. bacteriaphage (phage)
    can infect bacteria mostly contain dna
  33. T-even phage
    infects e-coli
  34. bacterial viruses
    consists of icosahedral head, central tube sheath collar base plate tail pins tail fibers
  35. temperate phage
    special dna phages that undergo absorption and pentrationĀ  but are not replicated or released immediatly
  36. lysogeny
    period of virus inactivity
  37. lysogenic conversion
    acquiring a new trait as a results of the temperate phage
  38. viral cultivating
    • isolate and identfy
    • prepareĀ  viruses for vaccines
    • research viral structures