Which chemical is utilised during the isolation of $DNA$ at the end of precipitation?

$mRNA$ silencing is known as .........

In which type of bioreactor do air bubbles increase the oxygen transfer area?

How does one visualise $DNA$ on an agarose gel?

In the presence of a chromogenic substrate,what color colonies do recombinants and non-recombinants produce,respectively?

Which of the following steps are involved in the process of recombinant biotechnology? Arrange in correct order.
$I.$ Extraction of the desired gene product
$II.$ Amplification of the gene of interest
$III.$ Isolation of a desired $DNA$ fragment
$IV.$ Ligation of the $DNA$ fragment into a vector
$V.$ Insertion of recombinant $DNA$ into the host
Correct order is: