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Question #46989
The Question
A researcher is comparing the cytological basis of the aseptate, coenocytic mycelium of Rhizopus (Condition X) with a human cell culture treated with a chemical that completely inhibits the Anaphase-Promoting Complex (Condition Y). Which of the following statements accurately differentiates the underlying mechanisms of these two conditions?
Options
- A.
Condition X results from repeated karyokinesis not followed by cytokinesis, whereas Condition Y causes cell cycle arrest at metaphase due to the inability to separate sister chromatids.
- B.
Condition X leads to polyploidy due to the failure of homologous chromosome separation, whereas Condition Y leads to a multinucleate syncytium.
- C.
Both conditions represent a failure of the spindle assembly checkpoint, but Condition X occurs during meiosis while Condition Y occurs during mitosis.
- D.
Condition X is formed by the dissolution of septa between adjacent cells, whereas Condition Y results from the failure of cytokinesis after a successful telophase.
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
Phycomycetes_Aseptate_Hyphae|Fungal_Wall_Chemistry|Cell_Wall_Osmotic_Stress
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: The student must distinguish between a programmed absence of cytokinesis (leading to a functional multinucleate/coenocytic state) and a pathological arrest of karyokinesis (APC failure preventing anaphase).
A common misconception is confusing 'coenocytic' (multiple distinct nuclei due to absent cytokinesis) with 'polyploidy' (multiple chromosome sets due to failed separation), or believing that coenocytic hyphae form by the fusion of cells (dissolution of septa) rather than continuous nuclear division.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biological Classification - Class 11 |
| Concept | Phycomycetes Aseptate Hyphae |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |