Assertion : Plasmids are extrachromosomal $DNA$.

Reason : Plasmids are found in bacteria and are useful in genetic engineering.

Which one is a true statement regarding $DNA$ polymerase used in polymerase chain reaction?

The characteristics of a molecular probe are

$I.$ very long molecule

$II.$ double-stranded

$III. DNA$ or $RNA$

$IV$. complementary to a part of desired gene

The correct pair is

An alien $DNA$ is linked with the origin ofreplication, so that this alien piece of $DNA$ can replicate and multiply itself in the host organism This can also be called ……

The ability to transform normal cells into cancerous cells is found in