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Ch 5 Viruses and Other Acellular Infectious Agents Presentation

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Slide 1 Viruses and Other Acellular Infectious Agents Chapter 5 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Viruses • Major cause of disease • Also important as a new source of therapy • New viruses are always emerging • Important members of aquatic world • Important in evolution • Transfer genes between bacteria Slide 7 Viruses • Acellular infectious agents • Only reproduce within living cells • Possess only one type of nucleic acid • DNA or RNA • Virologists • Scientists that study viruses • Virology • Study of viruses Slide 8 General properties of viruses • Virion • Complete virus particle • Consists of ≥ 1 molecule of DNA or RNA enclosed in a coat of protein • May have additional layers • Carbohydrates, lipids, additional proteins • Cannot reproduce independent of living cells nor carry out cell division as prokaryotes and eukaryotes do Slide 9 Generalized Structure of Viruses Slide 10 Virions Infect All Cell Types • Bacterial viruses are called bacteriophages (phages) • Most are eukaryotic viruses • Plants, animals, protists, and fungi • Classified into families based on • Genome structure, life cycle, morphology, genetic relatedness Slide 11 3 ways that viruses differ from living cells 1. Have a simple, acellular organization 2. The presence of DNA or RNA, but not both, in almost all virions 3. The inability to reproduce independent of cells and carry out cell division • In contrast t ...
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