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16 Cards in this Set

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  • Back
do viruses contain ribosomes?
NO
are viruses capable of protein synthesis?
no, they dont have any ribosomes
what does obligate intracellular parasite mean?
always require a living host where the viruses can enter the cell and replicate their nucleic acid
what are the 3 parts of the survival dilema of viruses?
1. replicate genome
2. pack genome to ensure transmission
3. alter structure and or function of the host
define virion
a complete virus particle that represents the extracellular phase of the virus life cycle; at the simplest, it consists of a protein capsid surrounding a single nucleic acid molecule
define: capsid
the protei coat or shel that surounds a virion's nucleic acid
define: nucleocapsid
the nucleic acid and its surrounding protein coat or capsid; the basic unit of virion structure
define: envelope
the outer membranous layer that surrounds the nucleocapsid in some viruses
define: peplomer
a protein or protein complex thatextends from teh virus envelpe and often is important in virion attachmetn to the host cell surface
define: protomer
an individua subunitof a viral capsid; a capsomer is made of protomers
define: capsomer
The ring-shaped morphological unit of which icosahedral capsids are constructed
define: eclipse phase
infectious virus cannot be seen or recovered from infected cells
when does the eclipse phase end?
when the first virus particle is observed w/in the viral cell
define: latent phase
progeny virus accumulates intra-cellulary
when does the latent phase end?
when the first free virus is released; different families have different time periods
what are the 7 stages of viral multiplication?
adsorption (attachment)
penetration
uncoating
transcription/translation
replication of genome
assembly/maturation
release/egress