In Southern blotting,which of the following is separated by gel electrophoresis?

Given below are two statements.
Statement $I$ - The isolated $DNA$ of donor organism is cleaved by suitable restriction endonuclease to form $DNA$ fragments with cohesive staggered or blunt ends.
Statement $II$ - The foreign $DNA$ or passenger $DNA$ can also be obtained directly from genomic or cDNA library.
In the light of above statements,select the correct option given below:

Select the incorrect statement regarding the continuous culture system.

Which of the following techniques is $NOT$ used for introducing $DNA$ into a host cell in $r-DNA$ technology?

Spooling is:

What is the ultimate objective of $r-DNA$ technology?