What are transgenic bacteria? Illustrate using any one example.

(N/A) Transgenic bacteria are those that contain a foreign gene intentionally introduced into their genome.
They are genetically manipulated to express a desirable gene for the production of various commercially important products.
An example of transgenic bacteria is $E. coli$. In the plasmid of $E. coli$,two $DNA$ sequences corresponding to the $A$ and $B$ chains of human insulin are inserted to produce the respective human insulin chains.
After the insertion of the insulin gene into the bacterium,it becomes transgenic and starts producing chains of human insulin.
Later,these chains are extracted from $E. coli$ and combined to form mature human insulin.