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a genetic structure in a cell that can replicate independently of the chromosomes, typically a small circular DNA strand in the cytoplasm of a bacterium or protozoan. Plasmids are much used in the laboratory manipulation of genes
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Plasmids are extra chromosomal dna found in cytoplasm of bacteria,it is a double stranded dna.it plays major role in the  bio technology.the plasmids helps the bacteria from antibiotics aganist it.it helps in transfer of character from one organism 2 another
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