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