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Question #46962
The Question
Paralytic shellfish poisoning can occur when humans consume bivalves that have accumulated toxins from Gonyaulax during a 'red tide'. This toxin specifically binds to and blocks the voltage-gated channels responsible for the rapid influx of ions during the generation of an action potential. If this toxin reaches the central nervous system, what would be its precise effect on the functioning of the corpus callosum?
Options
- A.
Complete cessation of inter-hemispheric communication due to the inability of the axonal membranes to undergo depolarization.
- B.
Continuous, uncontrolled transmission of impulses between the cerebral hemispheres due to the inhibition of the Na+/K+ ATPase pump.
- C.
Failure of signal integration due to the inability of the axonal membranes to undergo repolarization, locking them in a depolarized state.
- D.
Disruption of inter-hemispheric coordination due to the blockage of voltage-gated calcium channels at the axonal terminals.
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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
Dinoflagellate Bioluminescence and Toxins|Nutrient Cycling Reservoirs|Red Tide
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: This question requires the synthesis of Biological Classification (Gonyaulax/Red tide toxins) with Neural Control and Coordination (Action potential generation and Brain anatomy).
The common misconception is confusing the roles of different ion channels.
Students must recognize that the 'rapid influx' during an action potential is Na+-dependent (depolarization), and applying a blockade to a white matter tract (corpus callosum) results in a failure of signal propagation, not a synaptic or repolarization failure.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Dinoflagellate Bioluminescence and Toxins |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |