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Question #45163
The Question
A multinational corporation patents a transgenic crop expressing a novel cry gene. Due to a failure in oversight by the GEAC (Genetic Engineering Appraisal Committee), pollen from this crop introgresses into wild relatives, spreading the insecticidal trait into natural ecosystems. Which of the following statements regarding the physiological mechanism of this transgene and its ecological fallout is INCORRECT?
Options
- A.
The introgressed cry gene product exists as an inactive protoxin in the wild plant and requires the alkaline pH of the insect's alimentary canal to solubilize the crystals.
- B.
The uncontrolled spread of this trait may cause a decline in specific non-target insect populations, effectively removing 'rivets' from the ecosystem and threatening its stability.
- C.
The ecological risk is amplified because the activated Cry toxin creates pores in the insect midgut independently of specific epithelial receptors, leading to broad-spectrum mortality.
- D.
If the introgressed transgene is cryIAc, it will act as a selective pressure specifically against Lepidopterans like the cotton bollworm, while leaving Coleopterans unaffected.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Traditional Knowledge|Bioprospecting|Invasive Competitors
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that 'alkaline pH activates the toxin' but forget the second crucial step for toxicity: 'binding to specific midgut epithelial receptors'.
The common misconception is that pH activation alone guarantees toxicity across all insects, ignoring the receptor-mediated specificity that makes Cry proteins strictly insect-group specific.
This question traps students who fail to link molecular specificity with ecological impact.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biotechnology and Its Applications - Class 12 |
| Concept | Biopiracy and Patents |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |