3
Question
Assertion :
Bacillus thuringenesis is toxic to many
insects.
Reason: It inhibits ion transport in the midgut.
Assertion :
Bacillus thuringenesis is toxic to many insects.
Reason: It inhibits ion transport in the midgut.Open in App
Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The cry gene of Bacillus thuringenesis produces a protein, that forms crystalline inclusions, i.e: is crystal in nature in the bacterial spores. These proteins are responsible for the insecticidal activities of the bacterial strains. In alkaline environment of insect midgut. these proteins are solubilized. Then to release core toxic fragments these proteins undergo proteolytic digestion. These toxins bind to receptor in brush border of midgut epithelial cells. As a result brush border membrane develops bacterial spores, most likely non-specific in nature, and cause influx of ions and water into the resulting in their swelling and eventually lysis. So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'
The cry gene of Bacillus thuringenesis produces a protein, that forms crystalline inclusions, i.e: is crystal in nature in the bacterial spores. These proteins are responsible for the insecticidal activities of the bacterial strains. In alkaline environment of insect midgut. these proteins are solubilized. Then to release core toxic fragments these proteins undergo proteolytic digestion. These toxins bind to receptor in brush border of midgut epithelial cells. As a result brush border membrane develops bacterial spores, most likely non-specific in nature, and cause influx of ions and water into the resulting in their swelling and eventually lysis.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'
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