Advertisements
Advertisements
Question
Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because ______.
Options
bacteria are resistant to the toxin
toxin is immature
toxin is inactive
bacteria encloses toxin in a special sac
Advertisements
Solution
Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because toxin is inactive.
Explanation:
Bacillus thuringiensis produces protein crystals during a particular phase of its growth. These crystals have a deadly insecticidal protein. The Bt toxin protein exists as inactive protoxins; however, when an insect consumes the inactive toxin, it is transformed into an active form due to the alkaline pH of the insect’s stomach, which solubilises the crystals. The active toxin adheres to the surface of midgut epithelial cells, causing cell swelling and lysis, eventually leading to the insect’s death, although it does not harm Bacillus.
APPEARS IN
RELATED QUESTIONS
What happens when Meloidegyne incognitia consumes cells with RNAi gene?
How has the use of Agrobacterium as vectors helped in controlling Meloidogyne incognita infestation in tobacco plants? Explain in the correct sequence.
How has the use of Agrobacterium as vectors helped in controlling Meloidegyne incognitia infestation in tobacco plants? Explain in correct sequence.
A protoxin is ______.
Bt toxin obtained from ______.
Many proteins are secreted in their inactive form. This is also true of many toxic proteins produced by microorganisms. Explain how the mechanism is useful for the organism producing the toxin?
Bt cotton is resistant to pest, such as lepidopteron, dipterans and coleopterans. Is Bt cotton also resistant to other pests as well?
What are the various advantages of using genetically modified plants to increase the overall yield of the crop?
Certain specific bacterial spores are mixed in water and sprayed over Brassica crop to control butterfly caterpillars.
Name this bacterium and its mode of action on the butterfly caterpillars.
"RNA interference has been used to produce transgenic tobacco plants to protect them from the infestation by specific nematodes." Explain the novel strategy exploited by the biotechnologists.
