Micro Chapter 6

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Department
Biological Sciences
Course
BIOL 2051
Professor
All Professors
Semester
Winter

Description
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 proteinsInfectious agents smaller than virusesViroids and PrionsViroidsRNA without capsid viruses without capsidsInfect plantsPrionsProteinonly infectious agentBSE mad cow scrapie sheep CreutzfeldJakob kuru humans chronic wasting disease deer elkDefective protein causes normal protein to take on abnormal shape loses normal functionVirus StructureCapsidsCapsid protein surrounding nucleic acidCapsid are arranged to give virion symmetry Icosahedral capsids poliovirus herpes virusRoughly spherical20 equilateral triangles or facesFilamentous capsids M13 EbolaLong tube of protein with genome insideTube made up of hundreds of identical protein subunitsTube length reflects size of viral genomeComplex capsidsMixture of icosahedralfilamentous shapesMany bacteriophage viruses that infect bacteriaAsymmetrical shapesTend to be larger virusesPoxvirusesVirus StructureEnvelopesEnvelopelipid bilayer around capsid of some virusesAllows fusion to host cellOnly occurs if host cell not covered by cell wallBacteriophages are NONenvelopedEnvelope lipids come from host
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