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A linear DNA fragment and a plasmid has three restriction sites for EcoRI. How many fragments will be produced from linear DNA and plasmid respectively?

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If a linear DNA fragment and a plasmid, each has three recognition sites for EcoRI, then total of four fragments are produced from linear DNA fragment and  three from a circular plasmid. Restriction sites are the sites present on DNA molecule where restriction endonucleases like EcoRI cut the DNA.

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