The internal toxin named Cry-1Ac obtained fro | vedclass

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(D) $Bacillus$ $thuringiensis$ $(Bt)$ produces protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal

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Bollworms

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(D) $Bacillus$ $thuringiensis$ $(Bt)$ produces protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein. The $Bt$ toxin protein exists as inactive protoxins but once an insect ingests the inactive toxin,it is converted into an active form of toxin due to the alkaline $pH$ of the gut which solubilizes the crystals. The activated toxin binds to the surface of midgut epithelial cells and creates pores that cause cell swelling and lysis and eventually cause the death of the insect. Specific $Bt$ toxin genes were isolated from $Bacillus$ $thuringiensis$ and incorporated into several crop plants such as cotton. The proteins encoded by the genes $cryIAc$ and $cryIIAb$ control the cotton bollworms.

The internal toxin named $Cry-1Ac$ obtained from $Bacillus$ $thuringiensis$ is effective against which of the following?

Similar Questions

Tobacco plants resistant to a nematode have been developed by the introduction of $DNA$ that produces (in the host cells):

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$A$: $Bt$ toxin are protein crystals containing insecticidal protein.
$R$: $B. \text{ thuringiensis}$ forms these protein crystals throughout continuously during their growth period.

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