Bacterial%20VirusesSV

Bacterial%20VirusesSV - Bacterial Viruses, Viroids, and...

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Bacterial Viruses, Viroids, and Prions Viruses ± ± Contain a protein coat ± Some are enclosed by an envelope ± ± Most viruses infect only specific types of cells in one host ± Host range is determined by specific host attachment sites and cellular factors ± Obligate intracellular parasites ± ± generally species specific ± ± hosts = invertebrates, vertebrates, plants, protists, fungi, bacteria, archaea Comparison: Viruses and Bacteria ± Viruses Bacteria ± size(nm) 24-1000nm avg. 1000-3000nm (0.5mm max) ± intracellular parasite yes no (exceptions) ± binary fission no yes ± DNA + RNA no (not both) yes ± ATP production no yes ± ribosomes no yes ± antibiotic sensitivity no yes ± can pass thru ± filters yes no (exceptions) Helical Viruses Polyhedral VirusesEnveloped Viruses Complex Viruses Viral Taxonomy ± Family names end in - ± Genus names end in - ± Viral species: A group of viruses sharing the same genetic information and ecological niche (host). Common names are used for species. ± Subspecies are designated by a number
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Bacterial%20VirusesSV - Bacterial Viruses, Viroids, and...

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