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Question #46768
The Question
During the development of an angiosperm anther, a targeted chemical inhibitor specifically disrupts the function of the nucleolus in Microspore Mother Cells (MMCs) during the G2 phase. Which of the following represents the most direct consequence of this disruption on microsporogenesis?
Options
- A.
The MMCs will fail to replicate their genomic DNA, arresting the cell cycle before the onset of Meiosis I.
- B.
The MMCs will arrest at the G2/M transition due to impaired rRNA synthesis, preventing the translation of tubulin proteins required for the meiotic spindle.
- C.
The MMCs will undergo normal reductional division but fail to synthesize the callose wall, resulting in a tetrad of diploid microspores.
- D.
The MMCs will complete Meiosis I but fail to undergo Meiosis II, leading to the formation of a dyad of diploid microspores.
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
Nucleolar Functionality|Microsporogenesis Ploidy Shift|Meiotic Reductional Division
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Linking organelle function (Nucleolus -> rRNA) to cell cycle checkpoints (G2 protein synthesis) and reproductive biology (Microsporogenesis).
Students often memorize isolated facts but fail to connect that a lack of nucleolar activity directly starves the cell of ribosomes, which are immediately necessary for synthesizing spindle fibers (tubulin) required to initiate Meiosis I.
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 |