Exams › NEET › Biology

Bacillus thuringiensis forms protein crystals which contain insecticidal protein that

1. binds with epithelial cells of midgut of the insect pest ultimately killing it
2. is coded by several genes including the gene cry
3. is activated by acid pH of the foregut of the insect pest
4. does not kill the carrier bacterium which is itself resistant to this toxin

Correct answer: binds with epithelial cells of midgut of the insect pest ultimately killing it

Solution

Bacillus thuringiensis produces Cry protein crystals that, after being ingested, act in the insect midgut. The toxin binds to epithelial cells of the midgut, disrupting them and causing death of the pest.

Related NEET Biology questions

• Which of the following is true for Golden rice?
• What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?
• The crops engineered for glyphosate are resistant/tolerant to:
• The genetic defect - Adenosine deaminase (ADA) deficiency may be cured permanently by:
• In transgenics, expression of transgene in target tissue is determined by
• An improved variety of transgenic basmati rice

⚔️ Practice NEET Biology free + battle 1v1 →