<prompt> Lambda phage true ist:Cause mad cow diseaseLytic and lysogenic interconversion cant occurLytic form incorporated within host DNA and multiply causing rupture of cell membraneLysogenic form incorporates with host DNA and remains dormant  <response>: Ans. a Transduction Transmission of genetic material gene transfer acquisition of characteristic occur by four process. a. Transformation: - Transfer of genetic information about 10-50 genes through the free DNA. Seen mainly in pneumococci; bacillus species and Hemophilus influenza. Any characteristic may be transferred by transformation. b. Transduction: - Transfer of poion of DNA from one to other bacteria by agency of bacteriophage acts only as vehicle. It may be generalised when it involves any segment of donor DNA or restricted when specific bacteriophage transduces only a paicular genetic trait. It is most widespread mechanism of gene transfer among prokaryotes. Episomes and plasmids e.g. plasmid determining Pn resistance in staphylococci may also transduced. It is used in genetic engineering in the treatment of some inborn errors of metabolism. c. Conjugation Bacterial equivalent of sexual mating Described by Lederberg and Tatum in strain of E. coli K12, e.g. Transfer of episomes and plasmids of drug resistance. d. Lysogenic conversion: - Phage DNA becomes integrated with bacterial chromosome as the prophage which codes for new characteristic, e.g. toxin production in C. diptheriae. 