Biol 2051 Ch 6 (Got A+ on the test)

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Biological Sciences
BIOL 2051
All Professors

Chapter 6 Virus Structure and Function General Properties of Viruses virionsobligate intracellular parasite made of nucleic acid surrounded by a protein coatOnly replicate inside hostNo nucleus organelles cytoplasmViral genomes containinformation for taking over host cellinformation for making viral proteinsCapsid genome replication proteinsVirus StructureCapsidsCapsid protein coatsurrounding nucleic acidCapsid proteins are arranged to give virion symmetry Ocosahedral capsids poliovirus herpes virusRoughly spherical20 equilateral triangles or facesFilamentous capsids Long tube of protein with genome insideTube made up of 100s of identical protein subunitsTube length reflects size of viral genomes short tubeshort genomeComplex capsids Mixture of icosahedralfilamentous shapesMany bacteriophage viruses that infect bacteriaAsymmetrical irregular shapesTend to be larger virusesPoxvirusesVirus StructureEnvelopesEnvelopelipid bilayer around capsid of some virusesAllows fusion to host cell membraneOnly occurs if host cell not covered by cell wallbacteriophages are NONenvelopedEnvelope lipids come from hostNot encoded by viral genomeproteins embedded in envelope may be encoded by virusCoats viral capsid as virus leaves cellVirus StructureGenomeDNA or RNAIncludes genes encoding viral proteinsCapsidEnvelope proteins if virus is envelopedAny polymerase not found in host cellInternational Committee on Taxonomy of Viruses classification system based on1 Genome compositionDNA or RNA
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