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Question #46769
The Question
The nucleolus acts as a metabolic sensor tightly coupled to cytoplasmic energy flux. If a eukaryotic cell experiences a severe drop in ATP levels, a nucleolar stress response is triggered. Which of the following statements regarding this physiological event is INCORRECT?
Options
- A.
The nucleolus undergoes structural shrinkage, reflecting a transition from active cellular growth to senescence or apoptosis.
- B.
The ATP-dependent activity of RNA polymerase II within the nucleolus is suppressed, halting the transcription of 28S, 18S, and 5.8S rRNA.
- C.
The energy-dependent import of cytoplasmically synthesized ribosomal proteins into the nucleus is significantly reduced.
- D.
The depletion of ribosome biogenesis alters the cellular steady state, proving that non-membranous organelles respond to metabolic flux.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Nucleolar Functionality|Metabolic Flux and Steady State|Active vs Passive Gradient Logic
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Integrating Cell Biology (Chapter 8) with Molecular Basis of Inheritance (Chapter 6).
Students often remember that the nucleolus synthesizes rRNA but fail to distinguish the specific roles and locations of the three eukaryotic RNA polymerases.
The trap relies on 'Functional Overlap' and 'Location Specificity', substituting RNA Pol I with RNA Pol II.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Cell – The Unit of Life - Class 11 |
| Concept | Nucleolar Functionality |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |