The presence of a chromogenic substrategives………… ……coloured colonies

Select the correct pair.

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

Restriction endonucleases are enzymes which

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 ……