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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