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Question #45573
The Question
During an Intracytoplasmic Sperm Injection (ICSI) procedure using sperm from a transgenic animal model overexpressing a novel membrane protein, the sperm is successfully injected into the ovum's cytoplasm, yet syngamy fails. Based on the physiological bypasses of ICSI, what is the most scientifically accurate explanation for this failure?
Options
- A.
The transgenic protein inhibited capacitation in the female reproductive tract, preventing the sperm from penetrating the zona pellucida.
- B.
The altered sperm membrane prevented the acrosome reaction, which is an absolute prerequisite for the mechanical injection of sperm.
- C.
The transgenic modification sequestered cytosolic factors necessary for male pronucleus decondensation, a biochemical step ICSI cannot circumvent.
- D.
The in vitro environment failed to provide the necessary calcium influx required for the sperm to initiate the cortical reaction before injection.
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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
ICSI Procedure|Sperm Capacitation Location|Transgenic Animal Purpose
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often rigidly apply the rule that 'capacitation and acrosome reaction are essential for fertilization' without adapting to the specific mechanics of Assisted Reproductive Technologies (ART).
The trap lies in failing to distinguish between physical entry barriers (which ICSI bypasses) and intracellular biochemical events like pronucleus decondensation (which ICSI cannot bypass).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Reproductive Health - Class 12 |
| Concept | ICSI Procedure |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |