Conversion of ATP to ADP releases

Options

A. Energy
B. Enzyme
C. Hormone
D. Electricity.

Answer

**Step-by-Step Solution:**

1. **Understanding ATP and ADP**: ATP stands for adenosine triphosphate, which is a molecule that stores and provides energy for various cellular processes. When ATP is converted to ADP (adenosine diphosphate), it loses one phosphate group.

2. **The Process of Hydrolysis**: The conversion of ATP to ADP is a hydrolysis reaction. In this reaction, water is used to break the high-energy bond between the last phosphate group and the rest of the ATP molecule.

3. **Energy Release**: During the hydrolysis of ATP to ADP, energy is released. This energy is approximately 7.3 kilocalories per mole. This energy release is what makes ATP known as the "energy currency" of the cell.

4. **Metabolic Activities**: The energy released from the conversion of ATP to ADP is utilized by the cell to perform various metabolic activities, such as muscle contraction, active transport, and biochemical synthesis.

5. **Conclusion**: Therefore, the correct answer to the question "Conversion of ATP to ADP releases" is energy.

**Final Answer**: Energy

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