The ATP output of aerobic respiration is more than that of anaerobic respiration per one glucose molecule by

Options

A. 18 times
B. 2 times
C. 4 times
D. 8 times

Answer

To solve the question regarding the ATP output of aerobic respiration compared to anaerobic respiration per one glucose molecule, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the ATP Yield of Aerobic Respiration**:
- Aerobic respiration typically produces about 38 ATP molecules from one glucose molecule. This process occurs in the presence of oxygen and involves glycolysis, the Krebs cycle, and oxidative phosphorylation.

2. **Consider the ATP Yield of Anaerobic Respiration**:
- Anaerobic respiration, on the other hand, produces only 2 ATP molecules per glucose molecule. This process occurs in the absence of oxygen and mainly involves glycolysis followed by fermentation.

3. **Adjust for NADH Usage in Aerobic Respiration**:
- Although aerobic respiration can theoretically yield 38 ATP, 2 ATP are used in the transport of NADH into the mitochondria. Therefore, the net yield of ATP from aerobic respiration is 36 ATP.

4. **Calculate the Difference in ATP Yield**:
- Now, we can compare the ATP yields:
- Aerobic respiration: 36 ATP
- Anaerobic respiration: 2 ATP
- The difference in ATP yield is:
\[ 36 \, \text{ATP (aerobic)} - 2 \, \text{ATP (anaerobic)} = 34 \, \text{ATP} \]

5. **Determine How Many Times More ATP is Produced**:
- To find out how many times more ATP is produced in aerobic respiration compared to anaerobic respiration, we divide the ATP yield of aerobic respiration by that of anaerobic respiration:
\[ \frac{36 \, \text{ATP (aerobic)}}{2 \, \text{ATP (anaerobic)}} = 18 \]
- Therefore, aerobic respiration produces 18 times more ATP than anaerobic respiration per glucose molecule.

### Final Answer:
The ATP output of aerobic respiration is more than that of anaerobic respiration per one glucose molecule by **18 times**.

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