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(A) The first recombinant $DNA$ molecule was constructed by Stanley Cohen and Herbert Boyer in $1972$.They isolated the antibiotic resistance gene by

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Salmonella typhimurium

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(A) The first recombinant $DNA$ molecule was constructed by Stanley Cohen and Herbert Boyer in $1972$.They isolated the antibiotic resistance gene by cutting out a piece of $DNA$ from a plasmid which was responsible for conferring antibiotic resistance in the bacterium $Salmonella typhimurium$.This piece of $DNA$ was then linked to a plasmid vector, which acted as a vehicle to transfer the piece of $DNA$ into $Escherichia coli$.

The plasmid used for the construction of the first artificial recombinant $DNA$ molecule was obtained from which microorganism?

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