How many XMP are formed in calvin cycle for the production of one glucose molecule

Options

A. 2
B. 3
C. 4
D. 6

Answer

To determine how many XMP (xylulose-5-phosphate) molecules are formed in the Calvin cycle for the production of one glucose molecule, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Calvin Cycle**: The Calvin cycle is the process by which plants convert carbon dioxide into glucose. It involves a series of reactions that fix carbon and regenerate ribulose bisphosphate (RuBP).

2. **Carbon Fixation**: Each turn of the Calvin cycle incorporates one molecule of carbon dioxide (CO2) into an organic molecule. Since glucose (C6H12O6) contains six carbon atoms, the cycle must turn six times to produce one glucose molecule.

3. **Formation of G3P**: During the Calvin cycle, three-carbon molecules called glyceraldehyde-3-phosphate (G3P) are produced. For every three turns of the cycle, one G3P molecule is formed. Therefore, to produce one glucose molecule (which is made up of two G3P molecules), the cycle must turn a total of six times.

4. **XMP Formation**: In the context of the question, XMP refers to the intermediates formed during the Calvin cycle. Each turn of the cycle contributes to the formation of these intermediates. Therefore, if the cycle turns six times, it will produce six XMP molecules.

5. **Conclusion**: Since the Calvin cycle must turn six times to produce one glucose molecule, the answer to the question is that **6 XMP are formed in the Calvin cycle for the production of one glucose molecule**.

### Final Answer:
**6 XMP are formed in the Calvin cycle for the production of one glucose molecule.**