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Unformatted text preview: a. Single versus double RNA b. enveloped versus non-enveloped V. Virus Life cycles A. General – all viruses need host to replicate 1. virus enters cell 2. host cell replicates viral genome 3. viral genes transcribed 4. viral proteins / genes self-assemble 5. Completed virus departs cell B. Enveloped 1. Completed virus takes host membrane upon departure C. Retrovirus 1. transcriptase – enzyme that reverse transcribes viral RNA to DNA 2. integrase – enzyme that randomly inserts new DNA into cell genome Lecture Outline 7 – Viruses, Viroids and prions D. Bacteriophage 1. Lytic (virulent; cell death via lysis eminent) 2. Lysogenic (temperate; cell death via lysis eventual) VI. Viroids A. No Protein coat; small circular genome; make no proteins B. Can be parasites of other viruses VIII. Prions A. Misfolded proteins B. Replicate by touching other normal proteins...
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- Spring '11
- DNA, Tobacco Mosaic Virus, Capsid, virus enters cell, III. Viral Structure