Which restriction site is present in the $amp^R$ gene in $pBR322$?

By what other name is the gene gun known?

If a foreign $DNA$ fragment is inserted into the $BamHI$ site of $pBR322$ to create $r-DNA$,in which medium will the recombinants not grow?

$A$: Restriction enzymes belong to a larger class of enzymes called nucleases.
$R$: Each restriction enzyme recognizes a specific palindromic nucleotide sequence in the $DNA$.

Which of the following acts as a vector?

Which of the following foreign $DNA$ cannot multiply within a host cell?