In gel electrophoresis,separated $DNA$ fragments can be visualized with the help of:

Gel electrophoresis is used for:

What would happen when one grows a recombinant bacterium in a bioreactor but forgets to add antibiotic to the medium in which the recombinant is growing?

In $PCR$ technique,how many copies of the $DNA$ sample will be obtained after $6$ cycles are completed?

Which of the following cannot be used for direct gene transfer?

$I.$ In the process of recombinant $DNA$ technology,after several treatments,the purified $DNA$ is precipitated by adding chilled ethanol.
$II.$ The bacterial,plant,or animal cell is broken down by enzymes to release $DNA$,along with $RNA$,proteins,polysaccharides,and lipids.
Choose the correct option for the above statements.