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Question #45363
The Question
A researcher develops an experimental contraceptive vaccine that generates antibodies against specific adhesion integrins on the syncytiotrophoblast to prevent blastocyst implantation. During trials on male models, it is observed that while the morphological transformation of spermatids into spermatozoa is completely normal, the testes become packed with mature sperm that cannot enter the epididymis, eventually leading to pressure-induced atrophy and secondary autoimmune orchitis. Based on the principles of molecular mimicry, which specific physiological process is directly inhibited by these cross-reacting antibodies?
Options
- A.
Spermiogenesis, due to the failure of acrosome formation and flagellar elongation.
- B.
Spermiation, due to the failure to break down Sertoli-spermatid junctional complexes.
- C.
Spermatocytogenesis, due to the destruction of the blood-testis barrier and spermatogonia.
- D.
Capacitation, due to the blockage of cholesterol efflux in the seminiferous tubules.
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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
Spermiation|Implantation_and_Syncytiotrophoblast
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The primary trap relies on the classic NCERT confusion between 'Spermiogenesis' (differentiation) and 'Spermiation' (release).
By introducing a clinical immunology scenario (molecular mimicry between trophoblast implantation and Sertoli-spermatid detachment), it forces the student to recognize that adhesion proteins are critical for holding the sperm during maturation, and their targeted failure specifically halts the release phase (spermiation), leaving the morphological phase (spermiogenesis) intact.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Human Reproduction - Class 12 |
| Concept | Spermiogenesis vs. Spermiation |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |