What triggers activation of protoxin to ...

What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm? (A) Body temperature (B) Moist surface of midgut (C) Alkaline pH of gut (D) Acidic pH of stomach

Body temperature

Moist surface of midgut

Alkaline pH of gut

Acidic pH of stomach

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The correct Answer is:

Alkaline pH of gut

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The trigger for activation of toxin of Bacillus thuringiensis is (A) Acidic pH of stomach (B) High temperature (C) Alkaline pH of gut (D) Mechanical action in the insect gut

In Bt cotton, the Bt toxin present in the plant tissue as protoxin is converted into active toxin due to (A) Presence of conversion factors in insect gut (B) Alkaline pH of the insect gut (C) Acidic pH of the insect gut (D) Action of gut microorganisms

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 sterilize 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.

Choose the correct option for the toxic protein produced by B. Thuringiensis : (A) it acts in acidic medium and binds to epithelial cells of foregut. (B) it acts in neutral medium and binds to epithelial cells of hindgut. (C) it acts in alkaline medium and binds to epithelial cells of foregut. (D) it acts in alkaline medium and binds to epithelial cells of midgut.

Answer briefly: (a) Why are villi present in the intestine and not in the stomach? (b) How does pepsinogen change into its active form? (c) What are the basic layers of the wall of alimentary canal? (d) How does bile help in the digestion of fats?

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