For synthesis of a molecule of glucose, the requirement of `ATP` and `NADPH` is respectively

Options

A. 15 and 10
B. 33 and 22
C. 12 and 8
D. 18 and 12

Answer

To determine the requirement of ATP and NADPH for the synthesis of one molecule of glucose through the Calvin cycle, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Calvin Cycle**: The Calvin cycle is the process through which carbon dioxide is converted into glucose in plants. It involves a series of reactions that require energy in the form of ATP and reducing power in the form of NADPH.

2. **Identify the Inputs**: For every molecule of carbon dioxide (CO2) that enters the Calvin cycle, a specific amount of ATP and NADPH is required. According to the information provided:
- Each CO2 molecule requires **3 ATP** and **2 NADPH**.

3. **Calculate for Glucose**: To synthesize one molecule of glucose (C6H12O6), six carbon dioxide molecules are needed. Therefore, we need to calculate the total ATP and NADPH required for six CO2 molecules:
- **ATP Requirement**:
- For 6 CO2: \( 6 \text{ CO2} \times 3 \text{ ATP/CO2} = 18 \text{ ATP} \)
- **NADPH Requirement**:
- For 6 CO2: \( 6 \text{ CO2} \times 2 \text{ NADPH/CO2} = 12 \text{ NADPH} \)

4. **Final Requirement**: Thus, for the synthesis of one molecule of glucose, the total requirements are:
- **ATP**: 18
- **NADPH**: 12

5. **Select the Correct Option**: Based on the calculations, the correct answer is:
- **ATP = 18 and NADPH = 12** (Option D).