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Question #47676
The Question
Brown adipose tissue (BAT) utilizes Uncoupling Protein-1 (UCP-1) for non-shivering thermogenesis. Which of the following statements regarding the chemiosmotic coupling and bioenergetics in BAT mitochondria is INCORRECT?
Options
- A.
The electron transport system (ETS) continues to transfer electrons to oxygen, maintaining high oxygen consumption.
- B.
Protons return to the mitochondrial matrix primarily through the F0 component of ATP synthase, generating heat instead of ATP.
- C.
The electrochemical proton gradient across the inner mitochondrial membrane is dissipated without driving the phosphorylation of ADP.
- D.
The rate of NADH oxidation at Complex I remains active despite the uncoupling of oxidative phosphorylation.
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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
Complexes_I_to_IV|Proton_Gradient|Thermogenin
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often confuse 'uncoupling' with 'inhibition'.
A common misconception is that if ATP is not being formed, the ATP synthase machinery itself must be altered to produce heat, or that the ETS stops working.
The trap in Option B exploits the false assumption that the F0 particle is the absolute only route for proton re-entry.
In reality, UCP-1 creates a 'short-circuit' that completely bypasses Complex V, leaving the ETS fully functional but decoupled from ATP synthesis.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Respiration in Plants - Class 11 |
| Concept | ETS Complex Specificity |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |