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Bt toxin is :...

Bt toxin is :

A

intracellular lipid

B

polysaccharide

C

intracellular crystalline protein

D

extracellular crystalline protein

Text Solution

Verified by Experts

The correct Answer is:
D
Bacillus thuringiensis (Bt) is a gram-positive, spore forming bacterium that synthesises Bt toxin. A gene from Bt toxin has been cloned from the bacteria and is expressed into plants to provide resistance to pests without the need for insecticides. It secretes toxin extracellularly, which is a crystalline protein that blocks insect gut proteins upon ingestion. It is commonly used as biological insecticides that affect only the target insect pests and does not affect other insects.
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