When a protein-encoding gene is expressed in a heterologous host, it is called a:

Which of the following is added to precipitate purified $DNA$?

In the above represented plasmid,an alien piece of $\text{DNA}$ is inserted at the $\text{EcoRI}$ site. Which of the following strategies will be chosen to select the recombinant colonies?

Identify the correct sequence of steps in each cycle of Polymerase Chain Reaction $(PCR)$:

It is used to detect $HIV$ in suspected $AIDS$ patient and detect mutations in genes in suspected cancer patient too.

Polymerase chain reaction is most useful in