In Calvin cycle , G - 3 - P reacts with

Options

A. DHAP , E - 4, P , X - 5 - P
B. DHAP, Fructose , 1, 6 Bisphosphate , Ribose - 5 - Phosphate
C. `CO_2` RuBP , DHAP
D. DHAP , Fructose - 6 - phosphate , Sedoheptulose - 7 - Phosphate

Answer

**Step-by-Step Solution:**

1. **Understanding G3P**: G3P stands for glyceraldehyde 3-phosphate, which is a three-carbon sugar phosphate molecule. It is a key intermediate in the Calvin cycle of photosynthesis.

2. **Calvin Cycle Overview**: The Calvin cycle is a series of biochemical reactions that take place in the stroma of chloroplasts in photosynthetic organisms. It involves the fixation of carbon dioxide (CO2) and the production of glucose.

3. **Role of CO2**: In the Calvin cycle, carbon dioxide is fixed and combined with ribulose bisphosphate (RuBP) to form 3-phosphoglycerate (3-PGA). This is the first step of the cycle.

4. **Formation of G3P**: The 3-PGA molecules are then phosphorylated and reduced to form G3P. This process requires ATP and NADPH, which are generated in the light-dependent reactions of photosynthesis.

5. **Recycling of RuBP**: Some of the G3P produced is used to regenerate RuBP, allowing the cycle to continue. This is essential for the cycle to produce more G3P and ultimately glucose.

6. **Involvement of DHAP**: Dihydroxyacetone phosphate (DHAP) is another three-carbon molecule that can be interconverted with G3P. In the Calvin cycle, G3P can react with DHAP to form other carbohydrates.

7. **Final Reaction**: Therefore, in the Calvin cycle, G3P reacts with CO2, RuBP, and DHAP to continue the cycle and produce glucose.

8. **Conclusion**: The correct answer to the question "In the Calvin cycle, G3P reacts with" is CO2, RuBP, and DHAP.

**Final Answer**: G3P reacts with CO2, RuBP, and DHAP in the Calvin cycle.

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