$PCR$ is used for

Who discovered $PCR$ (Polymerase Chain Reaction)?

From the following tools/techniques of genetic engineering,identify those which are required for cloning a bacterial gene in animal cells and choose the correct option:
$I$. Endonuclease $II$. Ligase
$III$. $A. tumefaciens$ $IV$. Microinjection
$V$. Gene gun $VI$. Lysozyme
$VII$. Cellulase $VIII$. Electrophoresis

Select the incorrect statement regarding the continuous culture system.

$mRNA$ silencing is known as .........

Which of the following statements is incorrect?