The transfer of protein from electrophoretic gel to nitrocellulose membrane is known as

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

Who discovered $PCR$ (Polymerase Chain Reaction)?

Select the correct statements from the following:

When $DNA$ fragments are stained with ethidium bromide and viewed under $UV$ light,what color do they appear?

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: