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ch.6 virus

taxonomy and life cycles(2)

QuestionAnswer
a virus family is reffered to as a virdae
what do you use to classify viruses? baltimore classifies accroding to genome International classification of disease according to codes for medicine orders
how does ICD identify viruses codes are used for identifying tests, code for insurance, lab bills, mortality statistics, death certificates, confirm diagnosis
phage life cycle DNA viruses replicate in nucleus, RNA replicate in cytoplasm
two virus life cycles lyctic and lysogenic
temperment phage becomes part of host chromosome, replicates and creates progeny virus
virulent phages death to cell by lysis
steps of lyctic cycle attachment, penetration, biosynthesis, maturation (particles assembled), lysis (releases new phages)
lysogenic cycle is a specialized transduction, attachment and penetration
outcome of lysogenic cycle is prophage, integrated phage genome
the bacteria that has a prophage is called a lysogen
when the bacterial host is changed, its called lysogenic conversion
induction excision of viral genome
after induction it goes through lyctic cycle
steps of lysogenic cycle infects, incorporates, divides, prophage DNA passed on, excised from bacteria, goes into lysis
Transduction bacteriophage transfers bacterial DNA from one bacterium to another during sequential infections.
Transduction seems to play an important role in the evolutionary process of bacteria, giving them a mechanism for asexual exchange of genetic information.
Generalized transduction occurs when a random piece of bacterial chromosomal DNA is transferred by the phage during the lytic cycle.
Specialized transduction occurs at the end of the lysogenic cycle, when the prophage is excised and the bacteriophage enters the lytic cycle. Since
steps of transduction viral attachment and penetration, integration, excision, infection, recombination
Created by: olivemaryjo
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