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Question #45435
The Question
A patient experiences sudden, acute physiological stress. Serial blood samples analyzed via ELISA reveal that Hormone 'X' (secreted by the adrenal medulla) peaks within minutes and is rapidly cleared, whereas Hormone 'Y' (secreted by the adrenal cortex) peaks later and persists in the circulation for hours. Based on the signal transduction pathways and kinetics of these hormones, which of the following statements is INCORRECT?
Options
- A.
Hormone X is water-soluble and generates second messengers like cAMP or IP3, whereas Hormone Y is lipid-soluble and directly regulates gene expression.
- B.
The prolonged systemic persistence of Hormone Y, as quantified by ELISA, correlates with its mechanism of altering gene expression, whereas the rapidly cleared Hormone X relies on transient biochemical cascades.
- C.
Hormone Y exerts its delayed but sustained physiological response by binding to specific membrane-bound receptors that subsequently internalize and translocate to the nucleus to initiate transcription.
- D.
The secretion of Hormone X is an immediate response mediated by direct neural innervation, whereas Hormone Y secretion relies on a slower blood-borne peptide signal from the pars distalis.
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
Cortisol|Adrenal_Medulla|Catecholamines
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that steroid hormone-receptor complexes translocate to the nucleus to alter gene expression, but they fail to precisely recall the initial location of the receptor.
The trap in Option C exploits this by mixing a correct downstream effect (nuclear translocation and transcription) with a fatal anatomical flaw (membrane-bound receptors), testing the student's ability to distinguish between peptide and steroid signal transduction pathways as outlined in the NCERT Chemical Coordination chapter.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Chemical Coordination and Integration - Class 11 |
| Concept | Adrenal Cortex vs Medulla |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |