What are $amp^R$ and $tet^R$?

Which technique is used to separate $DNA$ fragments?

$A$ specific recognition sequence identified by endonucleases to make cuts at specific positions within the $DNA$ is:

In which year were the two enzymes responsible for restricting the growth of bacteriophage in $E. coli$ isolated?

The given figure is the diagrammatic representation of the $E. coli$ vector $pBR322$. Which one of the given options correctly identifies its certain component$(s)$?

$A$ - Restriction endonucleases are also called 'molecular scissors'.
$R$ - When fragments generated by restriction endonucleases are mixed,they join together due to their sticky ends.