The figure below shows three steps $(A, B, C)$ of a process. Select the option giving the correct identification $:-$

Select the correct sequence of steps in $PCR$.

$A$ probe is used in which stage of genetic engineering?

In the presence of a chromogenic substrate,what color colonies do recombinants and non-recombinants produce,respectively?

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.

Plasmid $pBR322$ has a $PstI$ restriction enzyme site within the gene $amp^R$ that confers ampicillin resistance. If this enzyme is used for inserting a gene for $\beta$-galactosidase production and the recombinant plasmid is inserted into an $E. coli$ strain: