It increases the efficiency with which $DNA$ enters the bacterium through pores in its cell wall.

Which one of the following statements is wrong with respect to separation of $DNA$ fragments on gel electrophoresis?

During the process of gene amplification using $PCR$,if very high temperature is not maintained in the beginning,then which of the following steps of $PCR$ will be affected first?

In the $PCR$ technique,how are the two strands of $DNA$ separated?

During $PCR$, primers bind to the $DNA$ strands in the . . . . . . step.

$PCR$ is a useful tool for the early diagnosis of an infectious disease. Elaborate.