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DrVirgo Forum Junior Topics: 731 Posts: 3487	Feb 03, 2006 - 10:40 AM       #1 How is a prophage created? A. Through activation of the recA gene produce of an exogenote B. Through infection of a bacterial cell with a virulent bacteriophage C. Through site-specific recombination of a temperate phage and bacterial DNA D. Through infection of a bacterial cell with lambda phage, lacking the lambda receptor E. Through excision of bacterial DNA and active lytic replication of a bacteriophage Please explain.
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reet Forum Guru Topics: 152 Posts: 1396	Feb 03, 2006 - 1:26 PM       #2 C ?
DrVirgo Forum Junior Topics: 731 Posts: 3487	Feb 03, 2006 - 3:32 PM       #3 Yes. Its C. Site-specific recombination of phage DNA into bacterial cell DNA by the process of lysogeny creates a prophage. The RecAgene product is necessary for homologous recombination with an exogenote but does not create a prophage. A virulent bacteriophage causes lysis of the host cell and not the production of the prophage. The lambda repressor is necessary in such cases to prevent the lytic life cycle. Choice E may be the pathway a prophage may choose to reinitiate its bacteriophage lytic lifestyle, but it would not be a means to create a prophage.
sugandhna Forum Newbie Topics: 1 Posts: 21	Feb 05, 2006 - 12:56 AM       #4 hey drvirgo, i am a second mbbs student and I just happened to visit the site, i love your posts, i mean they drive basic misconceptions away....keep it up.....thanks
DrVirgo Forum Junior Topics: 731 Posts: 3487	Feb 05, 2006 - 10:38 AM       #5 Thanks sugandhna. I hope you will post some interesting q's or anything else interesting on here as well.

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