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Question #46713
The Question
While studying the motility of Escherichia coli and Chlamydomonas, a student notes several features of their locomotory structures. Which of the following statements is INCORRECT regarding the comparative ultrastructure of prokaryotic and eukaryotic motile appendages?
Options
- A.
The eukaryotic flagellum is covered by an extension of the plasma membrane, whereas the bacterial flagellum is an extracellular proteinaceous filament.
- B.
The core of the eukaryotic flagellum, known as the axoneme, possesses a 9+2 arrangement of tubulin microtubules.
- C.
Both prokaryotic and eukaryotic flagella emerge from a structurally homologous, centriole-like basal body.
- D.
The bacterial flagellum is composed of three distinct parts: the filament, the hook, and the basal body.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
Ciliary/Flagellar Ultrastructure|Cell Theory Exceptions
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The 'Homology vs.
Analogy' trap due to shared nomenclature.
Because both domains use the terms 'flagellum' and 'basal body', students incorrectly assume structural homology.
Eukaryotic flagella are microtubule-based endomembrane extensions, whereas prokaryotic flagella are extracellular flagellin filaments driven by a completely different mechanism.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Cell – The Unit of Life - Class 11 |
| Concept | Cell Theory Exceptions |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |