Gene expression can be controlled with the help of  $\rm {RNA}$ . Explain the method with an example.

Which bacteria was the first to be used as biopesticide on the commercial scale in the world?

The bacterium Bacillus thuringiensis is widely used in contemporary biology as

$B t$ cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis $(Bt)$ is resistant to 

Microbes found to be very useful in genetic engineering are