Why Bt toxin gene does not kill the Bacillus bacteria in which it is found ?

why does Bt toxin not kill the Bacillus?

Why do toxic insecticide protein secreted by Bacillus thuringiensis kill insects?

Crystals of Bt toxin produced by some bacteria do not kill the bacteria because

In case of Bt cotton how does the toxic insecticide protein produced by bacterium kill the insect pest but not the cell Bacillus thuringiensis where the toxic protein is generated?

Bt toxin protein exist in which form.

Name the bacterium, from which 'Bt' toxin is produced.

Which of the following features of genetic code does allow bacteria to produce human insulin by recombinant DNA technology?