Identify the parts $A$ and $B$ from the given figure of the $pBR322$ cloning vector:

Identify the correct match for the given apparatus.
Apparatus $\to$ Function

Assertion : $Agrobacterium$ $tumefaciens$ is popular in genetic engineering because this bacterium is associated with the roots of all cereal and pulse crops.
Reason : $A$ gene incorporated in the bacterial chromosomal genome gets automatically transferred to the crop with which the bacterium is associated.

$DNA$ recombinant technology can be:

Which one of the following pairs is not correctly matched?

'Cloning' is meant for