Micro Ch 6,11
Card Set Information
Micro Ch 6,11
Okstate Micro 2013
What is a virus?
An obligatory intracellular parasite
all have a protein coat
target host cell receptors
What is the basic structure determining shape?
encoded for in the viral genome
it's composed of repeated protein subunits, minimizing the number of genes requires.
two main capsid forms
: symmetrical and asymmetrical
What is the virus protein coat?
What determines host range?
types of hosts a virus can infect
Symmetrical vs Asymmetrical Viruses
: filamentous or icosohedral
: T4 bacteriophages, poxviruses
What occurs in the lytic cycle?
bacteriphage replicates quickly, killing the host
the host cell explodes, releasing the bacteria
What happens in the lysogenic cycle?
bacteriphage is quiescent
integrates into cell chromosome as PROPHAGE
can reactivate to become lytic
What is tranduction?
the mechanism by which DNA moves from one bacterium to another (when a virus takes some of the host DNA with it)
What is prophage?
What are the viral genome types?
What are the three main viral genomes?
What are the steps of the animal virus life cycle? (in order)
What is the DNA life cycle?
virus enters cell and travels to nucleoid before uncoating
Uses host polymerase to create RNA template then replicate
What is the RNA life cycle?
RNA genome inserted into host cell
viral genome replicated using RNA dependant RNA polymerase
NEVER CONVERTS TO DNA
What is the retrovirus life cyle?
Binds to host then uncoats envelope, sending the capsid into host.
Uses ITS OWN
transcriptase, which creates a DNA copy of the original RNA genome.
DNA copy is inserted into host genome.
buds off host, creating envelope