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tasha081
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Virus
Non cellular, use cell to replicate
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viroid
- "sub viruses"
- plant pathogens
- consist only of RNA - single stranded covalent circles
- stable
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prion
- infectious protein
- no genetic material
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bacteriophage
bacterial virus
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capsid
protein coat which protects nucleic acid
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nucleocapsid
capsid and nucleic acid
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envelope
membrane surrounding some viruses
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adsorption
phage or virus attaches to cell
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penetration
Process of the virus or viral nucleic acid getting into the cell
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non-enveloped virus
ligand is in the capsid of the virus
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enveloped virus
ligand is in the envelope of the virus
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latency
when virus infects cell and becomes dormant
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What are examples of some latent viruses?
- -chicken pox
- -shingles
- -herpes
- -HIV & AIDS
- -cold sores, genital sores
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All viruses that can go latent are:
A) ineffective
B) DNA
C) budding
D) Retroviruses
B & D
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Retrovirus
Have extra steps in b/t penetration and multiplication
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What must a retrovirus do in between penetration and multiplation?
Copy viral RNA to DNA (reverse transcription)
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Satellite virus
- Viruses that have defective viral genomes
- "parasitzes" another virus called the helper virus
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segmented virus
multiple RNA segments that must all be packaged into a single virion to make an infectious virus
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multipartate virus
A virus with several genome segments that are packaged w/ 2-3 segments per virion
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+ RNA
- equivalent to mRNA; immediately codes for protein upon entering the cells
- most are infections w/out any other viral proteins
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-RNA
- equivalent to DNA
- must first be copied into +RNA/mRNA to make a protein
- must enter cell w/ an RNA dependant RNA polymerase to make the +RNA infectious
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Five significant properties of a virus
- -obligate intracellular parasite
- -viral genome is either DNA or RNA
- -in host cell, virus uses the biochemical machinery of the host cell to make viral components
- -progeny virions are assembled from the viral components
- -virus has an extracellular infectious phase
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Satellite viruses are unable to replicate thier genomes
A) True
B) False
A) True
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