Viral Infections

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Author:
kchardy
ID:
168758
Filename:
Viral Infections
Updated:
2012-09-03 18:45:43
Tags:
Virus DNA RNA
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Description:
Viral Invasion and Infection, Chapter 9
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  1. What is the smallest infectious organism?
    Virus
  2. What are viral envelopes?
    Membranes that cloak their capsids, often derived from the host cell membrane
  3. What is the NORMAL replication process in a cell
    • All information of the cell is held in the DNA
    • DNA unfolds to replicate to RNA
    • One cell is divided into 2
  4. What is the Viral DNA replication process?
    • Genetic information is stored in the RNA.  this is unstable, frequent mistakes are made during copying, with less ability to correct mistakes.
    • RNA viruses must translate themselves into RNA that ribosomes can read.  (it is backwards and has to carry transcriptase along with it)
  5. How does the virus reproduce?
    • Attachment - depends on site usually glycoproteins
    • Enters the cell - tansfers entire viral particle across the cell membrane by endocytosis
    • Transfers the viral genome through the cell membrane
    • Fusions of the viral envelope with the host cell membrane
    • Then sheds the coat.  (body now cannot recognize the virus)
  6. RNA or DNA virus
    Doube stranded
    DNA
  7. RNA or DNA virus
    Single stranded
    RNA
  8. RNA or DNA virus
    Replicated in the nucleus
    DNA
  9. RNA or DNA virus
    Replicated in the cytoplasm
    RNA
  10. RNA or DNA virus
    Use host cell enzymes to copy new ciral DNA and structural or functional proteins
    DNA
  11. RNA or DNA virus
    Positive sense RNA
    RNA
  12. RNA or DNA virus
    Brings its own covertor enzyme
    RNA
  13. What are some long term viral survival strategies?
    • Virus must be able to hide from or overcome immune system
    • Dormant in cells (herpes)
    • Infect new hosts
    • Mutate (frequency varies)
    • Leave the host cell with a cover (Hep C)

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