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Question #46934
The Question
Classical systematic classification relies on the vertical inheritance of stable chromosomal markers to establish phylogenetic relationships. However, the application of strict binomial nomenclature and fixed species concepts to bacteria is often complicated by rapid, non-lineal phenotypic shifts. Which of the following best explains the primary cause of this taxonomic instability in prokaryotes?
Options
- A.
The high frequency of mutations in the highly conserved 16S rRNA sequences during binary fission.
- B.
The reticulate evolution driven by the exchange of extrachromosomal DNA, conferring emergent traits independent of vertical descent.
- C.
The pleomorphic nature of the bacterial cell wall due to varying cross-linking in the peptidoglycan layer.
- D.
The integration of mesosomes with the nucleoid, which disrupts the stable segregation of genomic DNA.
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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
Systematic Classification Scope|Plasmid vs Chromosomal DNA|Prokaryotic Mesosome Geometry
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Bridging 'Cell Biology' (plasmids/extrachromosomal DNA) with 'Biological Classification' (phylogeny).
Students often memorize that plasmids confer unique phenotypic characters (like resistance) but fail to realize that this horizontal gene transfer fundamentally breaks the classical 'branching tree' model of vertical inheritance used in Linnaean taxonomy.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | The Living World - Class 11 |
| Concept | Systematic Classification Scope |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |