host range (4 minutes)
virus entering cell (2 minutes)
Lots in this one (10 minutes)
Zika virus and tissues (3 minutes)
mRNA vaccines (5)
interesting (5)
also (3)
virus DNA (11)
virions (3)
prions (9)
Quiz, pp. 330 -- 339
1. What does it mean that a virus is an "obligate intracellular parasite"?
2. Are there some viruses with a host range of only one?
3. Are there some viruses with a host range of more than one?
4. How does a virus identify a host cell?
5. Viruses of eukaryotes are usually t___________ specific.
6. Some viruses are ___NA and some are __NA.
7. A virulent phage uses the l_______ cycle, which destroys the cell; a l________ cycle doesn't destroy the cell.
8. Some viruses build a membrane around themselves using the membranes of the cells they invade, which tricks the cell into letting them in. Coronaviruses use this kind of membrane, which is a lipid bilayer so it is susceptible to hand w____________.
9. Why do we get symptoms of illness when a virus infects our cells? There should be several answers to this, found on page 335.
10. How does a vaccine work, briefly.
11. Why don't antibiotics work on viruses?
12. From page 337, explain three ways "new" viruses emerge.
13. Some viruses are known to cause c_________.
14. A plant virus can be spread to an individual plant through environmental, external factors (______________ transmission) or from the parent plant (______________ transmission).
15. A v______ is an infecting molecule, just a bit of RNA that infects. A p_________ is an infecting p_________. S_________ and m________ cow disease are caused by these proteins.
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