Question

What is true about Bt toxin?
(a) Bt protein exists as active toxin in the
Bacillus
(b) The activated toxin enters the ovaries of
the pest to sterilise it and thus prevent its
multiplication.
(c) The concerned Bacillus has antitoxins.
(d) The inactive protoxin gets converted into
active form in the insect gut

Answer 1

Answer:

a. Bt protein exist as active toxin in the Bacillus.

Answer 2

Option D

The inactive protoxin gets converted into  active form in the insect gut is true about Bt toxin

Explanation:

• The cry gene of Bacillus thuringiensis acts Bt protein which creates crystalline formation in the bacterial spores.
• The crystal proteins are dormant (prototoxins) in the bacterial figure but when they begin the insect gut they transform into active form due to the alkaline pH of the alimentary canal that solubilizes the crystals.
• The activated toxin adheres to the exterior of midgut epithelial cells and forms pores which generate cell inflammation and lysis and finally induce the death of the insect.