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Question #45490
The Question
In angiosperms that shed pollen at the 2-celled stage, hydration on the stigma triggers the transcription of specific genes required for the generative cell to enter mitosis. An experimental compound specifically binds to and blocks the 3' → 5' DNA strand of these genes. Which of the following accurately describes the consequence during pollen-pistil interaction?
Options
- A.
The generative cell will fail to form two male gametes because the coding strand for required regulatory RNAs is inhibited.
- B.
The generative cell will fail to form two male gametes because the template strand for required regulatory RNAs is inhibited.
- C.
Two male gametes will still form normally because RNA polymerase utilizes the 5' → 3' strand as the template.
- D.
The generative cell will divide prematurely in the pollen grain because the 3' → 5' strand normally acts as a transcriptional repressor.
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
Generative_Cell|Non-Coding_Strand_Utility|Transcription
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students frequently confuse the nomenclature of DNA strands during transcription.
The trap relies on knowing that the 3' → 5' strand is the 'template' (or non-coding) strand, while the 5' → 3' strand is the 'coding' strand.
By linking this molecular biology fact to the cytological event of generative cell division in the pollen tube, the question tests true NCERT-Plus synthesis and prevents rote memorization.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Sexual Reproduction in Flowering Plants - Class 12 |
| Concept | Generative Cell Division |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |