Calculate the number of ATP produced for one Glyceraldehyde 3-phosphate molecule by the end of aerobic respiration through Electron transport only

Options

A. 20
B. 14
C. 15
D. 19

Answer

To calculate the number of ATP produced from one Glyceraldehyde 3-phosphate (G3P) molecule by the end of aerobic respiration through the electron transport chain, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Products of G3P in Aerobic Respiration**:
- When one G3P molecule undergoes aerobic respiration, it is converted through glycolysis, the citric acid cycle (Krebs cycle), and the electron transport chain.
- During these processes, G3P produces 4 NADH molecules and 1 FADH2 molecule.

2. **ATP Production from NADH**:
- Each NADH molecule can produce approximately 3 ATP molecules during oxidative phosphorylation in the electron transport chain.
- Therefore, for 4 NADH molecules:
\[ \text{ATP from NADH} = 4 \, \text{NADH} \times 3 \, \text{ATP/NADH} = 12 \, \text{ATP} \]

3. **ATP Production from FADH2**:
- Each FADH2 molecule can produce approximately 2 ATP molecules during oxidative phosphorylation.
- Therefore, for 1 FADH2 molecule:
\[ \text{ATP from FADH2} = 1 \, \text{FADH2} \times 2 \, \text{ATP/FADH2} = 2 \, \text{ATP} \]

4. **Total ATP Calculation**:
- Now, we sum the ATP produced from both NADH and FADH2:
\[ \text{Total ATP} = \text{ATP from NADH} + \text{ATP from FADH2} = 12 \, \text{ATP} + 2 \, \text{ATP} = 14 \, \text{ATP} \]

5. **Conclusion**:
- Therefore, the total number of ATP produced for one Glyceraldehyde 3-phosphate molecule by the end of aerobic respiration through the electron transport chain is **14 ATP**.

### Answer:
The correct option is **Option 2: 14 ATP**.