We cut and paste DNA to create new organisms.
You already know that there are good bacteria that live in our body and help us with our vital functions such as, food digestion and preventing infection by other bacteria. We use a particular characteristic of bacteria, which is their ability to exchange DNA by plasmid transference, to confer them new properties, based on the genes we have discovered. This way we have bacteria that produces insulin for diabetes, and so on. Our molecular biologists are experts in copy and paste DNA to build microorganisms that can execute, with precision and accuracy, any biological function that we can find on nature. And some others that we may think of.