7 Viruses 2-2-11 - Viruses Viruses Ch 6; Sections 11.1,...

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Viruses Viruses Ch 6; Sections 11.1, 11.2, p 424-425
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Examples of Microbes Protists Fungi Viruses Algae Bacteria Archaea
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Three Domains of Life Bacteria, Archaea and Eukarya Prokaryotes Figure 1.27 Figure 1.5 Does not include viruses (no ribosomes, no rRNA)
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What is a Virus? What is a Virus? Not a living cell Infects a living host cell to replicate Depends on host metabolism Energy, materials, enzymes SARS Figure 6.1 T2 in E. coli Figure 6.2
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What is a Virus? What is a Virus? Composed of nucleic acid and protein Genome DNA or RNA Protective Protein Shell Capsid Protects genome Some have a viral envelope A virus may also be called a virion or virus particle Herpes virus Figure 6.10
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What is a Virus? What is a Virus? All forms of living cells may be infected by viruses Archaea, Bacteria and Eukaryotes Viruses that infect bacteria are called bacteriophage or phage Estimate of 10 32 viruses on earth Table 6.1
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What is a Virus? What is a Virus? Viruses are small Originally discovered to pass through filters that blocked bacteria Size range Porcine circovirus – (17 nm) smallest? Mimivirus – (300 nm) largest? E. coli >1,000 nm long Figure 6.5
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Not Viruses – But Even Smaller Not Viruses – But Even Smaller Than Viruses Than Viruses Viroids
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7 Viruses 2-2-11 - Viruses Viruses Ch 6; Sections 11.1,...

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