Gene amplification using primers can be done by

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:

The flowchart given below represents the process of recombinant $DNA$ technology. Identify $A$,$B$,and $C$.

In the context of blue-white screening,non-recombinant bacterial colonies appear blue in contrast to white recombinant colonies because:

Which statements are correct for gel electrophoresis to separate $\text{DNA}$ fragments?
$(a)$ $\text{DNA}$ is a negatively charged molecule and so it is loaded on the gel towards the anode terminal.
$(b)$ $\text{DNA}$ fragments travel along the surface of the gel whose concentration does not affect the movement of $\text{DNA}$.
$(c)$ Smaller the size of $\text{DNA}$ fragments,larger is the distance it travels through it.
$(d)$ Pure $\text{DNA}$ can be visualized directly by exposing it to $\text{UV}$ radiation.

Which of the following is the correct sequence of steps in the Polymerase Chain Reaction $(PCR)$?