Mechanism of Action of Bt Toxin

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2024 1 question

  1. Given below are two statements: Statement I: Bt toxins are insect group specific and coded by a gene $cry$ IAc. Statement II: Bt toxin exists as inactive protoxin in $B.\ thuringiensis$. However, after ingestion by the insect the inactive protoxin gets converted into active form due to acidic pH of the insect gut. In the light of the above statements, choose the correct answer from the options given below:

2024 Re-NEET 1 question

  1. Following are the steps involved in action of toxin in Bt. Cotton. A. The inactive toxin converted into active form due to alkaline pH of gut of insect. B. Bacillus thuringiensis produce crystals with toxic insecticidal proteins. C. The alkaline pH solubilises the crystals. D. The activated toxin binds to the surface of midgut cells, creates pores and causes death of the insect. E. The toxin proteins exist as inactive protoxins in bacteria. Choose the correct sequence of steps from the options given below: