In alcohol fermentation, ______ of energy in glucose is released and not all of it is trapped as high energy bonds of ATP.

Options

A. Less than 1%
B. More than 10%
C. Less than 7%
D. More than 40%

Answer

To solve the question regarding the energy released during alcohol fermentation, we can break it down into a series of steps:

### Step-by-Step Solution:

1. **Understand Alcohol Fermentation**: Alcohol fermentation is a type of anaerobic respiration that occurs in the absence of oxygen. It primarily takes place in yeast and some types of bacteria.

2. **Energy Yield from Glucose**: When glucose undergoes fermentation, it is broken down into pyruvic acid, which is then converted into ethanol and carbon dioxide. During this process, energy is released.

3. **ATP Production**: In the glycolysis phase of fermentation, one molecule of glucose produces 2 molecules of ATP. This is a relatively low yield compared to aerobic respiration, where more ATP is produced.

4. **Calculate Energy Efficiency**: The total energy content of one molecule of glucose is approximately 670 kilocalories. The energy yield from the 2 ATP produced is 2 × 7.3 kilocalories = 14.6 kilocalories.

5. **Determine the Efficiency**: To find the efficiency of energy capture during alcohol fermentation, we can use the formula:
\[ \text{Efficiency} = \left( \frac{\text{Energy from ATP}}{\text{Total energy in glucose}} \right) \times 100 \]
Plugging in the values:
\[ \text{Efficiency} = \left( \frac{14.6 \text{ kcal}}{670 \text{ kcal}} \right) \times 100 \approx 2.2\% \]

6. **Conclusion**: Since only about 2.2% of the energy in glucose is captured as ATP during alcohol fermentation, we conclude that the answer to the question is "less than 7%".

### Final Answer:
In alcohol fermentation, **less than 7%** of energy in glucose is released and not all of it is trapped as high energy bonds of ATP.

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