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COMEDKCOMEDK 2012Biotechnology : Principles and Processes
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Plasmids are extra-chromosomal, self replicating, usually circular, double stranded DNA molecules found naturally in many bacteria and also in some yeasts. It was discovered by Willium Hays and Joshua. Lederberg in 1952. Plasmids are usually not essential for normal cell growth and division, they often confer some traits on. the host organism.