Biotechnology and its Applications · Class 12 · CBSE · Science Biology
In genetically modified cotton expressing Bt toxin, the toxin becomes active in the insect because the insect midgut
Practice question from Biotechnology and its Applications (Class 12 · CBSE · Science Biology), with the correct answer and a step-by-step solution.
easy · MCQ · Q-A9B0DF
In genetically modified cotton expressing Bt toxin, the toxin becomes active in the insect because the insect midgut
- A.has an acidic pH that directly dissolves the insect gut
- B.has an alkaline pH and proteases that activate the Bt protoxinCorrect answer
- C.converts the toxin into an antibody against bacteria
- D.allows the inactive protoxin to enter the insect's nervous system unchanged
Solution
Bt bacteria produce an inactive protoxin. In the alkaline insect midgut, the protoxin is solubilised and activated by proteases. The active toxin binds to receptors on gut epithelial cells and forms pores, causing cell lysis and insect death.
More from Biotechnology and its Applications
- A plant is engineered to produce double-stranded RNA complementary to an essential gene of the root-knot nematode Meloidogyne incognita. Ho…
- Golden rice was developed primarily to address deficiency of which nutrient?
- Why can polymerase chain reaction (PCR) help in the early diagnosis of certain infectious diseases?
- Which pairing correctly matches a biotechnology application with its use?
Practise more Biology
Sign up free for adaptive practice on this chapter, with instant feedback and hints on every question.
Start practising freeFree to start · No credit card needed