One molecule of sucrose yields ............ ATP in anaerobic respiration

Options

A. 2
B. 4
C. 38
D. 36

Answer

To determine how many ATP molecules are yielded from one molecule of sucrose during anaerobic respiration, follow these steps:

### Step-by-Step Solution:

1. **Understand Anaerobic Respiration**:
Anaerobic respiration occurs in the absence of oxygen. It involves the breakdown of glucose to produce energy, but it results in an incomplete breakdown of the substrate.

2. **Identify the Product of Anaerobic Respiration**:
In anaerobic respiration, one molecule of glucose typically yields 2 ATP molecules. This is because the process does not fully oxidize glucose, leading to a lower energy yield compared to aerobic respiration.

3. **Relate Sucrose to Glucose**:
Sucrose is a disaccharide composed of two monosaccharides: glucose and fructose. When sucrose is metabolized, it is hydrolyzed into two molecules of glucose.

4. **Calculate ATP Yield from Sucrose**:
Since one molecule of glucose yields 2 ATP, and sucrose yields two molecules of glucose, the total ATP yield from one molecule of sucrose can be calculated as follows:
- 2 ATP (from the first glucose) + 2 ATP (from the second glucose) = 4 ATP.

5. **Conclusion**:
Therefore, one molecule of sucrose yields **4 ATP** during anaerobic respiration.

### Final Answer:
**4 ATP**

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