Which technique is used to isolate immunoglobulins,cellular enzymes,and $m-RNA$?

Which of the following is not a palindromic $DNA$ sequence?

Agarose is a natural polymer extracted from

Restriction endonucleases are isolated from some bacteria. Their role in bacteria is

Two bacteria found to be very useful in genetic engineering experiments are

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.