Separated bands of $\text{DNA}$ in agarose gel electrophoresis observed under $\text{UV}$ radiation are stained with

The master plate in the replica plating experiment contained the:

Explain $PCR$ in short.

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

What are the temperatures required for the three steps of the Polymerase Chain Reaction $(PCR)$ shown below?
$P \quad \quad Q \quad \quad R$

Palaeontologists unearthed a human skull during excavation. $A$ small fragment of the scalp tissue was still attached to it. Only a little $DNA$ could be extracted from it. If the genes of the ancient man need to be analysed,the best way of getting a sufficient amount of $DNA$ from this extract is: