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Question #45380
The Question
During human embryonic development, the blastocyst must undergo precise cellular differentiation for successful implantation. If a targeted chemical inhibitor disrupts the secondary messenger signaling (e.g., cAMP pathway) in the blastocyst, implantation is stalled. Which of the following statements regarding the cellular potency and structural differentiation at this stage is CORRECT?
Options
- A.
The Inner Cell Mass (ICM) cells are totipotent, and their failure to differentiate directly prevents the physical invasion of the endometrium.
- B.
The trophoblast differentiates into the multinucleated syncytiotrophoblast, a signal-dependent process essential for endometrial invasion and apposition.
- C.
The transition from the morula to the blastocyst stage involves a shift in the trophoblast cells from pluripotency to totipotency.
- D.
Implantation is stalled primarily because the inhibited Inner Cell Mass cannot secrete human Chorionic Gonadotropin (hCG) to maintain the corpus luteum.
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
Syncytiotrophoblast|Differentiation_of_Stem_Cells|Secondary_Messenger_Cascade
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between cellular potencies (Totipotent vs.
Pluripotent) and the functional anatomy of the blastocyst.
A common misconception is attributing the invasive properties and hCG secretion to the Inner Cell Mass (the future embryo) rather than the trophoblast derivatives (the extra-embryonic support).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Human Reproduction - Class 12 |
| Concept | Implantation and Syncytiotrophoblast |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |