What is the significance of adding proteases at the time of isolation of genetic material $(DNA)$?

The stirrer in a stirred-tank bioreactor facilitates:

In the presence of a chromogenic substrate,recombinant bacteria give:

Which of the following method$(s)$ is used to introduce foreign $DNA$ into host cells?

Given below are two statements:
Statement $I:$ The $\text{DNA}$ fragments extracted from gel electrophoresis can be used in the construction of recombinant $\text{DNA}$.
Statement $II:$ Smaller size $\text{DNA}$ fragments are observed near the anode while larger fragments are found near the wells in an agarose gel.
In the light of the above statements,choose the most appropriate answer from the options given below:

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