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Question #46131
The Question
An exclusively marine, radially symmetrical organism with tissue-level organization is observed to exhibit bioluminescence. If this organism is experimentally exposed to a high concentration of colchicine, which of the following represents the primary structural and physiological disruption it will experience?
Options
- A.
Inhibition of tubulin polymerization, disrupting the 9+2 axonemal integrity of its eight external rows of comb plates, thereby halting locomotion.
- B.
Depolymerization of actin microfilaments within the ctenes, leading to the failure of the sliding filament mechanism and loss of motility.
- C.
Inactivation of dynein ATPase within the 9+0 microtubular arrangement of the ciliary shaft, preventing the coordinated beating of cilia.
- D.
Blockage of calcium-dependent exocytosis in its cnidoblasts, resulting in the failure of its capture-feeding mechanism.
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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
Ctenophora Locomotion|Microtubule Dynamic Instability|Ciliary Axoneme
Why This Question Is Tricky
Common Mistakes
The 'Conceptual Pivot' requires students to integrate organismal taxonomy (Ctenophora locomotion via ciliated comb plates) with cell biology (cilia ultrastructure being a 9+2 microtubule axoneme) and applied cytology (colchicine as a tubulin polymerization inhibitor).
The distractors test common location traps (9+2 vs 9+0 arrangement), functional overlaps (actin vs tubulin in motility), and taxonomic confusion (assigning cnidoblasts to Ctenophores).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Ctenophora Locomotion |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |