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-1 assembly (maturation) assemble to produce new phage particles -1 protease if DNA damaged, SOs repair system turns on, activates a ______ -1 restriction enzymes recognizes specific short nucleotide sequences in foreign DNA such as phage DNA and then cuts the DNA molecules at these sequences Never Missed You’ve gotten all of these right! Select these 4 +1 capsid protein coat is ______; protects nucleic acid from enzymes and toxic chemicals in the environment +1 capsomeres protein coat is composed of identical protein subunits called .... +1 6000 2828 2013 report: ______ viruses, ________ species +1 early proteins translated within minutes; nuclease degrades host DNA; protein modifies hosts RNA polymerase to not recognize its own promoters No Answers Yet You still haven't studied these! Select these 130 DM Iwanowsky Martinus Beijerinck found that mosaic disease was caused by an unusual agent too small to be seen with a light microscope, filterable FW Twort F d'Herelle discovered a "filterable" that destroys bacteria, first to see viruses under a scanning/transmission electrom microscope poison virus means viruses simply genetic information: DNA or RNA within protective coat
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inert particles incapable of metabolism, replication, or motility Genome hijacks cell's replication machinery outside inside inert ______ cells; ______, direct activities of cells viruses infectious agents, not organisms; can classify generally based on type of cell they infect 10 10 smallest viruses: _____ nm, _____ genes 800 largest viruses: ______ nm virion (viral particle) consists of nucleic acid surrounded by a protein coat nucleocapsid capsid plus nucleic acids enveloped viruses have lipid bilayer envelope; envelope has same lipid bilayer that cells have matrix protein between nucleocapsid and envelope; only in enveloped viruses nonenveloped (naked) viruses lack envelope; more resistant to disinfectants nonenveloped most bacteriophages are enveloped or nonenveloped? viral genome either DNA or RNA, never both; genome linear or circular; double or single stranded phages ______ have tail fibers spikes many animal viruses have ______ icosahedral helical complex 3 main shapes of viruses icosahedral appear spherical, 20 flat triangles (soccer ball) helical appear cylindrical, arranged in a helix complex more complicated structure. Phages, icosahedral nucleocapsid (head), long helical protein component (tail) international committee on viral taxonomy (ICVT) publishes classification of viruses
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virus genus ends in .... disease species name often name of .... oral fecal route enteric virus respiratory route respiratory viruses zoonotic viruses cause zooness (animal to human) arbovirus (from arthropod borne) are spread by arthropods; often can infect widely different species lytic phages temperate phages filamentous phages 3 general types of bacteriophages
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