Energy released in aerobic respiration is higher than the one available from anaerobic respiration by

Options

A. 8 times
B. 18 times
C. 28 times
D. 36 times.

Answer

To determine how much more energy is released in aerobic respiration compared to anaerobic respiration, we can follow these steps:

### Step 1: Understand Aerobic Respiration
Aerobic respiration occurs in the presence of oxygen. It involves three main stages:
1. Glycolysis
2. Krebs Cycle (also known as the TCA cycle)
3. Electron Transport Chain

### Step 2: Calculate ATP Yield in Aerobic Respiration
In aerobic respiration, the complete breakdown of one molecule of glucose results in the production of **36 molecules of ATP**.

### Step 3: Understand Anaerobic Respiration
Anaerobic respiration occurs in the absence of oxygen. It typically involves the process of fermentation, where glucose is partially broken down.

### Step 4: Calculate ATP Yield in Anaerobic Respiration
In anaerobic respiration, the breakdown of one molecule of glucose results in the production of only **2 molecules of ATP**.

### Step 5: Compare the ATP Yields
Now, we compare the ATP yields from both processes:
- Aerobic respiration: 36 ATP
- Anaerobic respiration: 2 ATP

### Step 6: Calculate the Difference in Energy Yield
To find out how many times more energy is released in aerobic respiration compared to anaerobic respiration, we can use the formula:
\[ \text{Difference} = \frac{\text{ATP from Aerobic}}{\text{ATP from Anaerobic}} \]
\[ \text{Difference} = \frac{36}{2} = 18 \]

### Conclusion
The energy released in aerobic respiration is **18 times higher** than that available from anaerobic respiration. Therefore, the correct answer is **option B, 18 times**.

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