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Question #46125
The Question
A living marine sponge is experimentally exposed to a chemical agent that specifically abolishes the proton gradient across the inner mitochondrial membrane without affecting cytoplasmic enzymes. Which of the following represents the most immediate and critical physiological fallout in the organism?
Options
- A.
Cessation of flagellar movement in choanocytes, resulting in the complete arrest of food gathering and respiratory exchange.
- B.
Failure of amoebocytes to distribute nutrients due to the direct inhibition of substrate-level phosphorylation.
- C.
Inability of the pinacoderm to maintain the structural integrity of the spongocoel, causing the physical collapse of the canal system.
- D.
Reversal of the water flow direction, exiting through the ostia instead of the osculum due to a sudden osmotic imbalance.
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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
Choanocytes|Chemiosmotic ATP Synthesis Logic|Mitochondrial Density
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: This question forces students to bridge cellular bioenergetics (chemiosmosis/respiration) with Animal Kingdom physiology (Poriferan canal system).
A common misconception is compartmentalizing knowledge—students often fail to realize that disrupting a microscopic proton gradient directly paralyzes the macroscopic hydraulic system of a sponge by starving its choanocytes of ATP.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Porifera Canal System dynamics |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |