Identify the correct match for the given diagram.

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:

$DNA$ precipitation out of a mixture of biomolecules can be achieved by treatment with

Explain the method for the separation and isolation of $DNA$ fragments.

How many copies of a gene can be produced from $1$ gene through $30$ cycles of $PCR$?

In which type of bioreactor do air bubbles increase the oxygen transfer area?