Microiology - virology
- Created by: luceebrown
- Created on: 09-01-20 09:46
Virology:
The basic features and activities of a virus:
virus = nucleic acis surrounded by a protein coat, they replicate in a host cell
have intracellular and extra cellular phases
- they are introduced to a population where they spread and evade the immune system;
city virus = change quickly to avoid detection in a similar way to antigenic variation
the buy what i can afford virus = old enough to develop ways to avoid detection
infect whatever moves virus = highly infectious so by the time they are recognised they have already infected another person
how viruses spread between cells:
infect cells;
attatchement to a host cell is mediated by the protein spikes on the surface = glycoproteins
membrane fusion is when the virus fuses with the plasma membrane of a cell
endocytosis = virus is incorporated into the vesicle which fuses with viruses envelope
budding:
when the naked virus goes to surface of plasma membrane the hosts membrane surrounds it and releases it as a bud
persistent infection = slow release of virus without cell death
latent infection = virus hides in cell but doesnt cause harm untill it has later emerged
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