Term
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Definition
-Bacteriphage particles are pieces of DNA or RNA surrounded by protective proteins
-icosahedra have 20 sides and 12 vertices or variations |
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Term
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Definition
-have coat proteins coating the viral nucleic acid helix
-other coats protect a dsDNA core, attached to a proteinaceous tail (T4) or without tail fibers (lamda) |
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Term
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Definition
-have dsDNA, ssDNA, dsRNA, and ssRNA
-can be linear or circular
-some are even segmented with one segment per one or two genes
-nonsegmented the whole viral genome serves as an operon |
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Term
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Definition
many small viruses have overlapping genes--gene within a gene in another reading from
-a few codons from one gene being shared in a different reading frame |
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Term
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Definition
-you can synchronously infect a batch of bacteria with a batch of virions and each stage of the infection cycle will occur at the same time with all the bacteria in the culture
-latent period has a steady number of infected cells, followed by a big increase in infected cells after the new virions are released to infect other cells--one-step growth curve |
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Term
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Definition
| -host cells are starved and the viral sequence inserts itself into the host genome (a prophage) and is released |
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Term
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Definition
-surrouned by a lipid envelope with viral glycoproteins which recognizes a specific protein on the target host cell membrane
-others are "naked" with only protein capsid no envelope |
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Term
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Definition
-have both RNA and DNA phases in their infection cycle
-After entry into the cell, the genome is copied into double stranded DNA by a few molecules of reverse transcriptase that the virus caries in its capsid |
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Term
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Definition
| -has LTRs (long terminal repeats) at each and three doing units in between |
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Term
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Definition
-long terminal repeats
-three functions: promoter, enhancer, transcription terminator
-gag, pol and env are expressed as polyprotein that is cut into functional and structural proteins |
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Definition
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Term
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Definition
| -satellite viruses are molecular parasites on plant viruses; code for their own coat protein but nothing else and are dependent upon their helper virus |
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Term
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Definition
-Satellite RNAs don't even code for their own coat protein and are encapsulated with the helper virus coat protein
-also dependent upon the helper virus for replication |
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Term
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Definition
-smallest independent pathogen
-360 bp of circular ssRNA and depending on the host's ddRNA polymerase (transcriptase) for their replication
still need no helper virus |
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Term
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Definition
small circular ssRNA like viroids but are dependent on a helper virus for replication
-hepatitis delta virus
-rolling replication, producing a concatomer RNA |
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Term
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Definition
-coded for by one of our own genes
-mutated for PrPsc predisposes one to Creutzfeldt-Jakob disease
-power to induce other PrPsc or even PrPc proteins to take one that same perverted, pathogenic structure |
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Term
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Definition
-mobile element which have a DNA intermediate as they transpose from one location (donor) to the other (recipient) in the genome
-if a copy is left behind it is "replicative"; if not then "conservative" |
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Term
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Definition
-mobile elements which have an RNA intermediate as they transpose
-depend on normal cellular transcription to produce the RNA intermediate which is reverse transcribed by RT to produce dsDNA which is integrated by retroelement integrase into the recipient DNA |
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Term
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Definition
-can be carried by transposons, effect the integration of the transposon
-single transposon is caused in insertion sequence while a composite transposon comprises a gene |
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