Which of these is $NOT$ a method to make host cells 'competent' to take up $DNA$?

Southern blotting technique uses . . . . . . paper for embedding $DNA$ strands.

Which of the following diagnostic tools allows the detection of very low concentration of bacteria or viruses by amplifying their nucleic acid?

Which of the following statements is correct in the context of observing $DNA$ separated by agarose gel electrophoresis?

$DNA$ precipitation out of a mixture of biomolecules can be achieved by treatment with

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.