Question

If 6 $CO_2$ molecules entered into the Calvin cycle, number of G-3-P formed, net gain of G-3-P and G-3-P participated in RUBP regeneration are:

• A. 12, 2 & 10
• B. 2, 12 & 10
• C. 10, 12 & 2
• D. 6, 12 & 10

Hint:

12 G3P produced; 10 go back to keep the cycle turning, 2 go out to make sugar.

Answer 1

The Correct Option is A

Step 1: Concept
The stoichiometry of the Calvin cycle for 6 $CO_2$ molecules.

Step 2: Analysis
6 $CO_2$ molecules combine with 6 RuBP to form 12 molecules of 3-PGA, which are then reduced to 12 molecules of G-3-P. Out of these 12 G-3-P molecules: * 2 molecules are used for the net production of one hexose sugar (net gain). * 10 molecules are used to regenerate 6 molecules of RuBP (regeneration).

Step 3: Conclusion
The values are 12 formed, 2 net gain, and 10 for regeneration.

Final Answer: (A)