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Question #45293
The Question
A researcher experimentally induces a severe Auxin-Cytokinin imbalance in the Root Apical Meristem (RAM) of a plant, triggering a signaling cascade that completely inhibits the polymerization of tubulin proteins. Which of the following statements regarding the immediate consequences of this interference is NOT correct?
Options
- A.
The meristematic cells will undergo mitotic arrest, preventing the degradation of cohesin proteins at the centromere.
- B.
The affected tissue will exhibit an accumulation of cells with a 2C DNA content due to the cessation of the cell cycle.
- C.
The geometry of the spindle apparatus will be disrupted, leading to a failure of kinetochore microtubule attachment.
- D.
The RAM will lose its regenerative potential, leading to a rapid cessation of primary root growth.
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
Meristematic Totipotency|Growth Rate Quantification
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse the specific stage of cell cycle arrest caused by spindle inhibitors and the corresponding DNA content.
The trap relies on the assumption that 'cessation of the cell cycle' means cells remain in their resting G1 state (2C DNA).
However, tubulin inhibition specifically causes an M-phase arrest, meaning the cells have already passed through the S-phase and possess a 4C DNA content.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Cell Cycle and Cell Division - Class 11 |
| Concept | Spindle Attachment Geometry |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |