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Question #45215
The Question
In the context of photophosphorylation (the esterification of ADP to ATP) in chloroplasts, which of the following statements is INCORRECT regarding the energetic coupling and the specific roles of photosynthetic pigments?
Options
- A.
Accessory pigments in the Light Harvesting Complex absorb specific wavelengths of light and transfer energy to the reaction center via resonance.
- B.
The proton motive force required by the F0-F1 ATP synthase is established by an electron transport chain initiated exclusively by the photo-oxidation of Chlorophyll-a.
- C.
Accessory pigments protect Chlorophyll-a from photo-oxidation and directly contribute electrons to the primary electron acceptor to maintain the proton gradient.
- D.
The breakdown of the proton gradient across the thylakoid membrane provides the conformational energy required for the catalytic esterification of ADP to ATP.
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
ATP_Synthase|Photophosphorylation|Chemiosmosis
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between 'Energy Transfer' (resonance in antenna molecules) and 'Electron Transfer' (photo-oxidation at the reaction center).
A common misconception is that because accessory pigments absorb light, they also release electrons into the ETC.
The trap in Option C uses a 'Half-Truth'—it correctly states that accessory pigments protect Chlorophyll-a from photo-oxidation, but falsely claims they donate electrons.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Biomolecules - Class 11 |
| Concept | Nucleotide Phosphate Esterification |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |