Which one is used as a vector in genetic engineering?

Bacterial $DNA$ is modified by adding methyl groups. Why is this done?

$A$ probe,which is a molecule used to locate specific sequences in a mixture of $DNA$ or $RNA$ molecules,could be:

Hind $II$ always cuts $DNA$ molecules at a particular site called recognition sequence and it consists of : (in $bp$)

In recombinant $DNA$ technique,the term vector refers to a

Create a chart (with diagrammatic representation) showing a restriction enzyme,the substrate $DNA$ on which it acts,the site at which it cuts $DNA$,and the product it produces.