Microbes in Human WelfareMedium
Question
The bacterium Bacillus thuringiensis is widely esrd in contemporary biology as a/ an
Options
A.indicator of water pollution
B.insecticide
C.agent for production of dairy products
D.source of industrial enzyme
Solution
Bacillus thuringiensis is a Gram-positive, soil dwelling bacterium, also occurs naturally in the gut of caterpillars of various types of moths and butterflies.
During sporulation, Bacillus thuringiensis forms crystals of proteinaceous insecticidal -endot oxins (cry toxins), which are encoded by cry genes. It was determined that thr cry genes are harbored in the plasmids of Bacillus thuringiensis strains. Cry toxins have specific activties against species of the order-Lepidoptera (moths and butterflies), Diptera (flies and mosquitoes) and Coleoptera (beetles). Thus, Bacillus thuringiensis seves as an important reservoir of cry toxins and cry genes for the production of biological insecticides and insect resistant genetisally modified crops.
During sporulation, Bacillus thuringiensis forms crystals of proteinaceous insecticidal -endot oxins (cry toxins), which are encoded by cry genes. It was determined that thr cry genes are harbored in the plasmids of Bacillus thuringiensis strains. Cry toxins have specific activties against species of the order-Lepidoptera (moths and butterflies), Diptera (flies and mosquitoes) and Coleoptera (beetles). Thus, Bacillus thuringiensis seves as an important reservoir of cry toxins and cry genes for the production of biological insecticides and insect resistant genetisally modified crops.
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