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Question #47426
The Question
A patient is diagnosed with an autoimmune disorder where T-cells mistakenly attack the myelin sheath of the central nervous system (CNS). To manage the progression of the disease, the patient is prescribed a bioactive molecule produced by the fungus Trichoderma polysporum. Which of the following statements is INCORRECT regarding the patient's condition and the prescribed treatment?
Options
- A.
The prescribed molecule is Cyclosporin A, which mitigates the autoimmune interference primarily by suppressing T-cell activation.
- B.
The destruction of the myelin sheath abolishes saltatory conduction, forcing the action potential to propagate continuously at a significantly reduced velocity.
- C.
The loss of the insulating myelin sheath causes ionic current leakage, increasing the energy expenditure required by the Na+/K+ pump to maintain ionic gradients.
- D.
The prescribed immunosuppressant directly restores saltatory conduction by stimulating Schwann cells to remyelinate the damaged axons in the CNS.
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
Nodes_of_Ranvier|T-Cell_Activation|Myelin_Sheath
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: This question tests the synthesis of three distinct NCERT chapters (Microbes in Human Welfare, Human Health & Disease, and Neural Control & Coordination).
The primary trap relies on 'Location Specificity' and 'Functional Overlap'.
Students often memorize 'Myelin = Schwann cells' without distinguishing between the CNS (Oligodendrocytes) and PNS (Schwann cells).
Additionally, it tests the misconception that immunosuppressants actively repair tissue (remyelination) rather than merely halting the autoimmune attack.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Neural Control and Coordination - Class 11 |
| Concept | Saltatory Conduction Nodes |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |