57.The crystals produced by Bacillus thuringiensis contain A. Nontoxic insecticidal proteins B. Toxic insecticidal carbohydrates C. Toxic insecticidal lipids D. Toxic insecticidal proteins
Option D The toxic insecticidal proteins secreted by Bacillus thuringiensis kill the insect and not the bacteria itself because the Bt toxin proteins exist as an inactive protein which become active due to the alkaline environment in the gut of insects and thus cause intestinal perforation and donot harm the bacteria itself.
