Multiple choice

B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein and exist as inactive protoxins, but once an insect ingests the inactive toxin, it is converted into an active form of toxin. This is due to __________.

  1. the acidic pH of the gut, which solubilises the crystals

  2. the neutral pH of the gut, which solubilises the crystals

  3. the alkaline pH of the gut, which solubilises the crystals

  4. the alkaline pH of the respiratory tract, which solubilises the crystals

  5. the acidic pH of the respiratory tract, which solubilises the crystals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

B. thuringiensis forms protein crystals during a particular phase of its growth. These crystals contain a toxic insecticidal protein and exist as inactive protoxins, but once an insect ingests the inactive toxin, it is converted into an active form of toxin.

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