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A recombinant DNA molecule was created b...

A recombinant DNA molecule was created by ligating a gene to a plasmid vector. By mistake. An exonuclease was added to the tube containing the recombinant DNA. How does this affect the next step in the experiment, i.e., bacterial trasformation?

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As in plasmid recombinant DNA molecule is circular and closed, exonuclease will not affect it, as it has no free ends. It will have no impact on experiment because exonuclease removes nucleotides only from free ends of DNA.
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