GeneralStructure: Pre-formed enzymes may be present- Polymerases - DNA or RNA-Replicases-copyRNA- Reverse transcriptase - synthesis of DNAfrom RNA (AIDS virus)16
16 General Structure • Pre-formed enzymes may be present – Polymerases – DNA or RNA – Replicases – copy RNA – Reverse transcriptase – synthesis of DNA from RNA (AIDS virus)
HowVirusesAreClassified: Main criteria presently used are structure, chemicalcomposition, and genetic makeup: Currently recognized: 3 orders, 63 families, and 263genera of viruses: Family name ends in -viridae, i.e.Herpesviridae. Genus name ends in -virus, Simplexvirus· Herpes simplex virus I (HSV-l)17
17 How Viruses Are Classified • Main criteria presently used are structure, chemical composition, and genetic makeup • Currently recognized: 3 orders, 63 families, and 263 genera of viruses • Family name ends in -viridae, i.e.Herpesviridae • Genus name ends in -virus, Simplexvirus • Herpes simplex virus I (HSV-I)