Ussable energy of respiration is

Options

A. Immediately consumed in cellular activities
B. Trapped in ATP molecules
C. Stored as heat
D. Used in charging biomolecules into activity

Answer

### Step-by-Step Solution:

1. **Understanding Usable Energy in Respiration**:
- Respiration is a biochemical process where cells convert glucose and oxygen into energy, carbon dioxide, and water. The energy produced during respiration is primarily stored in the form of ATP (adenosine triphosphate).

2. **Evaluating the Options**:
- **Option A**: "Immediately consumed in cellular activities" - This is incorrect because while energy is released during respiration, it is not immediately consumed; rather, it is stored for later use.
- **Option B**: "Trapped in the ATP molecule" - This is correct. The energy produced during respiration is primarily stored in ATP molecules, which can then be used for various cellular activities.
- **Option C**: "Stored as heat" - This is incorrect. While some energy is released as heat during respiration, it is not stored in this form.
- **Option D**: "Used in charging biomolecules into the activity" - This statement is misleading as it does not accurately describe the process of energy utilization in respiration.

3. **Conclusion**:
- The correct answer is **Option B**, which states that the usable energy of respiration is trapped in the ATP molecule.