The correct order of steps in Polymerase Chain Reaction $(PCR)$ is

Which of the following is used for direct gene transfer?

Thermal cycling is a key component of which technique?

The blue and white selectable markers have been developed which differentiate recombinant colonies from non-recombinant colonies on the basis of their ability to produce colour in the presence of a chromogenic substrate.
Given below are two statements about this method :
Statement-$I$ : The blue coloured colonies have $\text{DNA}$ insert in the plasmid and they are identified as recombinant colonies.
Statement-$II$ : The colonies without blue colour have $\text{DNA}$ insert in the plasmid and are identified as recombinant colonies.
In the light of the above statements,choose the most appropriate answer from the options given below:

In $r-DNA$ technology,the term 'elution' refers to:

Select the correct statements from the following: