The toxic Cry protein is released by the spor | vedclass

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Question

(C) The bacterium $Bacillus$ $thuringiensis$ $(Bt)$ produces protein crystals during a particular phase of their growth. These crystals contain a toxi

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Bacillus thuringiensis

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(C) The bacterium $Bacillus$ $thuringiensis$ $(Bt)$ produces protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein called $Cry$ protein. When the larvae of certain insects,such as the tobacco budworm or armyworm (which feed on plants like $Brassica$),ingest these spores,the alkaline $pH$ of the gut solubilizes the crystals,releasing the active toxin. This toxin binds to the surface of midgut epithelial cells and creates pores,causing cell swelling and lysis,eventually leading to the death of the insect larva.

The toxic $Cry$ protein is released by the spores of . . . . . . which kills the larvae of butterflies feeding on plants like $Brassica$.

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