Chapter 6 (got 96%)

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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 parasites made of nucleic acid surrounded by a protein coat must be in a host cell to do anythingOnly replicate inside a host cellNo nucleus organelles cytoplasmViral genomes containinformation for taking over host cellinformation formaking viral proteinsCapsid genome replication proteinsVirus StructureCapsidsCapsid protein coat surrounding nucleic acidCapsid proteins are arranged to give virion symmetry Icosahedral capsids polio virus herpes virusRoughly spherical20 equilateral triangles or facesFilamentous capsids M13 EbolaLong tube proteins with genome insideTube made up of 100s of identical protein subunitsTube length reflects size of viral genomeComplex capsids Phage T4Mixture of icosahedralfilamentous shapesMany bacteriophage virus that infects bacteria eg Phage T4 head tail and tail fibersAsymmetrical irregular shapes CowpoxTend to be larger virusesPoxvirusesEnvelopesEnvelope lipid bilayer around the capsid of some virusesAllows fusion to host cell membraneOnly occurs if host cell not covered by cell wallBacteriophagesare NONenvelopedEnvelope lipids come from hostNot encoded by viral genomeProteins embedded in envelope may be encoded by virusCoats viral capsid as virus leaves cellGenomeDNA or RNAIncludes genes encoding viral proteins
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