Which of the following components are used in gel electrophoresis?
$I.$ Ethidium bromide
$II.$ Restriction endonuclease
$III.$ Agarose
$IV.$ $UV$ radiation
Choose the correct option:

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

Which of the following statements are correct with respect to $DNA$ separation, isolation and visualization?
$A$. The cutting of $DNA$ is done by molecular scissors.
$B$. The $DNA$ fragments separate according to their size in an agarose gel, upon electrophoresis.
$C$. The separated $DNA$ fragments can be seen without staining when exposed to $UV$ light.
$D$. The separated $DNA$ fragments, when stained with ethidium bromide, can be seen in visible light.
Choose the correct answer from the options given below:

Polymerase chain reaction $\text{(PCR)}$ amplifies $\text{DNA}$ following the equation:

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 this technique,large quantities of biotechnological products such as antibiotics,vaccines,and enzymes are produced by maintaining and growing only the desired microbes/eukaryotic cells in a sterile environment.