(A) In the plasmid vector $pBR322$,the restriction enzyme recognition site for $BamHI$ is located within the tetracycline resistance gene $(tet^R)$. T

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(A) In the plasmid vector $pBR322$,the restriction enzyme recognition site for $BamHI$ is located within the tetracycline resistance gene $(tet^R)$. This is significant because the insertion of foreign $DNA$ at this site inactivates the tetracycline resistance gene,allowing for the selection of recombinant colonies through insertional inactivation.