Molecular scissors are known as .....

Which antibiotic resistance is naturally found in $E. coli$?

The two bacteria found to be very useful in genetic engineering experiments are .............. .

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

The antibiotic resistance gene of a plasmid vector is used in the selection of which of the following when foreign $DNA$ is inserted?

In $Ti$-plasmid, which of the following is removed: