Hind $II$ always cuts $DNA$ molecules at a particular point called a recognition sequence,which consists of: (in $bp$)

The enzyme known as restriction endonuclease:

Given below are two statements:
Statement $I$: Plasmids are autonomously replicating $DNA$.
Statement $II$: Plasmids are extrachromosomal $DNA$.
In the light of the above statements, choose the correct answer from the options given below:

The tumour-inducing capacity of $Agrobacterium \; tumefaciens$ is located in large extra-chromosomal plasmids called

Which one of the following statements is not correct about a plasmid?

Primers are