Viruses Flashcards
1
Q
Virions
A
- extracellular phase
- few or no enzymes
- not able to reproduce independently of live cells
2
Q
Viruses
A
- intracellular phase
- hijack host cell metabolism to reproduce itself
3
Q
How do Viruses differ from living cells?
A
- simple acellular organization
- either DNA or RNA in virion
- must reproduce in host
4
Q
Structural characteristics
A
10nm - 40nm
nucelocapsid covered with capsid
5
Q
Icosahedral and Helical capsids
A
- macromolecular
- protomers
- associate after replication to form capsid
- “self-assembly”
6
Q
Helical and Icosahedral Arrangement
A
- H: helix around nucleus
- I: capsomers containing hexamers or pentamers
7
Q
Viral envelopes
A
- membrane from host cell
- proteins coded by viral genes
- spikes or peplomers
8
Q
Peplomers function
A
neuraminidase -spikes for penetration
hemagglutinin - spikes bind to RBC
9
Q
Complex viruses
A
T-Even Coliphages
10
Q
Proviral DNA
A
genome of a retrovirus after it was intergrated into host chromosome
