From which bacterium is the restriction endonuclease $Sal I$ isolated?

Which of the following is an incorrect pair?

In addition to $Taq$ polymerase enzyme,which other thermostable $DNA$ polymerases have been isolated to be used in Polymerase Chain Reaction $(PCR)$?

Identify the labels $M$ and $N$ in the following agarose gel electrophoresis representation.

Which of the following is important in genetic engineering?

Given below are two statements.
Statement $I$: Restriction enzyme $BamHI$ has its recognition site in $tet^R$ region of $pBR322$.
Statement $II$: $E. coli$ having $pBR322$ with a desired $DNA$ if inserted at $BamHI$ site can grow in medium containing tetracycline.
In the light of the above statements, choose the correct answer from the options given below.