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Why does the Bt toxin not kill the bacte...

Why does the Bt toxin not kill the bacterium that produces it but kills the insect that ingest it?

Text Solution

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In the bacterium Bt toxin exists as inactive protoxings, but it becomes active in the gut of insects due to alkaline pH.
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Bt toxins are not toxic to bacillus and Bt cotton plant but toxic to insects. Explain.

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Knowledge Check

  • Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because

    A
    Toxin is inactive
    B
    Toxin is immature
    C
    Bacteria are resistant to the toxin
    D
    Bacteria encloses toxin in a special sac

  • Read the following statements carefully and select the appropriate option given below. (i) Specific Bt toxin gene were isolated from Bacillus thuringiensis and incorporated into several crop plants such as cotton. (ii) Bt toxin gene has been cloned from the plant and been expressed in bacteria to provide resistance to insects without the need for insecticide. (iii) Plants, bacteria, fungi and animals whose genes have been altered by manipulation are called GMO. (iv) Using Agrobacterium vectors, cestode specific gene were introduced into the tobacco plant. (v) In gene therapy, genes are isolated from the person's cells and tissues to treat a disease.

    A
    (i) and (ii) are incorrect
    B
    (ii) and (iii) are incorrect
    C
    (ii) and (iv) are incorrect
    D
    (iv) and (v) are incorrect

  • Crystals of Bt toxin produced by Bacillus thuringiensis do not kill the bacteria themselves because.

    A
    Bacteria is resistant to toxin
    B
    Toxins only kill animals
    C
    Toxin is inactive
    D
    Toxin is protein

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