Which of the following has popularized the $PCR$ (polymerase chain reaction)?

Special sequence in the $DNA$ recognized by restriction endonuclease is called

Identify the desirable characteristics for a plasmid used in $rDNA$ technology from the following.
$A$. Ability to multiply and express outside the host in a bioreactor.
$B$. $A$ highly active promoter
$C$. $A$ site at which replication can be initiated
$D$. One or more identifiable marker genes
$E$. One or more unique restriction sites.

The enzyme which can cut molecules of $DNA$ into segments is known as

Two enzymes responsible for restricting the growth of bacteriophages in $E. coli$ were isolated. One was methylase and the other was restriction endonuclease. What is the significance of methylase?

The genome of transducing phages is