Identify the part of a bioreactor which is used as a foam breaker from the given figure.

r-$DNA$ is inserted within the coding sequence of an enzyme,$\beta$-galactosidase. This results in the inactivation of the gene for the synthesis of this enzyme,which is referred to as . . . . . . .

When a foreign $DNA$ is introduced into an organism,how is it maintained in the host and how is it transferred to the progeny of the organism?

Which of the following is correct for polymerase chain reaction $(\text{PCR})$?

The optimum temperature for polymerisation in $PCR$ is $....$ while the enzyme responsible for the mentioned step can tolerate temperatures up to $....$. Select the correct option according to the blanks.

The figure below shows three steps $(A, B, C)$ of a process. Select the option giving the correct identification $:-$