BIMM 120 CH 6
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How do viruses evolve?
coevolve with host
three components of T4 bacteriophage
head, helical neck, tail fibers
what infects E. coli?
T/F - viruses have their own separate position on the tree of life
false; viruses are non-living
what mediates host recognition and attachment?
what is the empty phage capsid left outside the cell called?
bacterial virus growth curve
one-step growth curve
three stages of one-step growth curve
- eclipse period
- rise period
- lytic stage
In a virus, what is nucleic acid contained?
T/F - viral capsid cannot self-assemble
encoded by the virus and allow it to recognize and infect host cells
filamentous virus as ____ symmetry
Five requirements for host infection
- host recognition and attachment
- genome entry
- genome expression and replication
- assembly of virions
- exit and transmission
lytic vs. lysogenic
- lytic kills host
- lysogenic: integrates into the cell's chromosome
prophage genes can be expressed and change host phenotype
bacterial defense against bacteriophage (3)
- genetic resistance: alter receptor proteins
- restriction endonuclease
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