Gene amplification using primers can be done by

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

$PCR$ (Polymerase Chain Reaction) technique is useful in:

Refer to the following statements for agarose-gel electrophoresis:
$(a)$ The $\text{DNA}$ fragments resolve according to their size.
$(b)$ The separated $\text{DNA}$ fragment can be visualised only after staining with ethidium bromide followed by exposure to $UV$ radiation.
$(c)$ $\text{DNA}$ is always loaded into the well.
$(d)$ The smallest fragment of $\text{DNA}$ is near the well.
Choose the correct statements:

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

On what basis are $DNA$ fragments separated in agarose gel electrophoresis?