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Question #45125
The Question
Which of the following statements is INCORRECT regarding the comparison between the lac operon in prokaryotes and RNA interference (RNAi) in eukaryotes?
Options
- A.
The lac operon regulates gene expression primarily at the transcriptional level, whereas RNAi operates at the post-transcriptional level.
- B.
In the lac operon, a repressor protein binds to the operator region to prevent mRNA synthesis by RNA polymerase.
- C.
RNAi involves a double-stranded RNA (dsRNA) molecule that binds to the promoter region of the target gene, thereby preventing RNA polymerase from initiating transcription.
- D.
The lac operon is an inducible system functioning under negative control, whereas RNAi takes place in all eukaryotic organisms as a method of cellular defense.
Check Your Answer
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
RNAi|Lac Operon|Repressor Protein|mRNA translation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The distinction between 'preventing transcript birth' (Transcriptional control) and 'transcript degradation' (Post-transcriptional control).
The trap relies on Functional Confusion; students often see the word 'silencing' in RNAi and incorrectly assume it acts like a repressor at the DNA/promoter level, failing to recognize that RNAi targets the mRNA after it has already been transcribed.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biotechnology and Its Applications - Class 12 |
| Concept | RNA Interference (RNAi) Mechanism |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |