When $DNA$ fragments are stained with ethidium bromide and viewed under $UV$ light,what color do they appear?

The separated bands of $DNA$ are cut out from the agarose gel and extracted from the gel piece. This step is known as . . . . . . .

The stirrer in a stirred-tank bioreactor facilitates:

What happens if a foreign $DNA$ fragment is inserted into the coding sequence of the $\beta$-galactosidase enzyme in a plasmid containing the coding sequence for the $\beta$-galactosidase enzyme?

Which method is used to amplify a desired gene in large numbers?

Select the appropriate option for $RNAi$.