Question

Short /Long answer type questions.
What are cry-proteins ? Name an organism that produces it. How has man exploited this protein to his benefit?

Answer 1

Cry proteins are toxic proteins (insecticidal proteins) secreted by Bacillus thuringiensis in crystal form during a particular phase of their growth. The toxin is coded by a gene called cry. The genes encoding cry proteins called Bt toxin genes were isolated from Bacillus thuringiensis and incorporated into several crop plants such as Bt cotton, Bt corn, etc. to provide resistance against insect pests.