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Question #47600
The Question
A researcher applies a highly specific inhibitor to a plant that completely blocks cyclic electron flow in the stroma lamellae, while leaving the Z-scheme (non-cyclic photophosphorylation) entirely unaffected. Based on the integration of photosynthetic products into amphibolic pathways, which of the following will be the primary metabolic consequence?
Options
- A.
Accumulation of 3-phosphoglycerate (3-PGA), restricting the export of triose phosphates required for lipid and amino acid biosynthesis.
- B.
Rapid depletion of 3-phosphoglycerate (3-PGA) as it is prematurely shunted into the mitochondrial matrix to compensate for the ATP deficit.
- C.
Accumulation of Ribulose-1,5-bisphosphate (RuBP) due to the direct inhibition of the RuBisCO-mediated carboxylation phase.
- D.
Increased synthesis of hexose sugars to maintain osmotic balance, thereby depleting the cellular amino acid precursor pool.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Cyclic Photophosphorylation Pathways|Amphibolic Pathway
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Connecting the light reaction's ATP/NADPH ratio to the specific biochemical bottleneck in the dark reaction.
Students often forget that Triose Phosphate (G3P), not glucose or 3-PGA, is the primary export product linking chloroplasts to the cell's amphibolic respiratory pathways.
A deficit in cyclic ATP specifically stalls 3-PGA reduction, halting this vital export.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Photosynthesis in Higher Plants - Class 11 |
| Concept | Cyclic Photophosphorylation Pathways |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |