The presence of a chromogenic substrate gives ............ coloured colonies.

Separation and purification by filtration,centrifugation of the desired compound produced in a bioreactor is a part of:

To introduce recombinant $DNA$ into a host cell,it is first kept on ice,then placed at ........ temperature,and finally placed back on ice. (in $^{\circ} C$)

$PCR$ (Polymerase Chain Reaction) technique is useful in:

Which of the following steps is/are catalysed by $Taq$ polymerase in a $PCR$?

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: