Stability of a substrate molecule is dependent on
A) Energy
B) Structure
C) Enzyme

Options

A. A , B , C
B. A only
C. A , B only
D. A , C only

Answer

To determine the stability of a substrate molecule, we need to analyze the options provided: Energy, Structure, and Enzyme.

1. **Understanding Stability**:
- Stability refers to how reactive a substrate molecule is. A more stable molecule is less reactive, while a less stable molecule is more reactive.

2. **Analyzing the Options**:
- **A) Energy**: Stability and energy are inversely proportional. This means that if the energy of a substrate is high, its stability is low. Therefore, energy plays a significant role in determining the stability of a substrate.
- **B) Structure**: While the structure of a molecule can influence its properties, the question specifically asks about stability in relation to the other options provided.
- **C) Enzyme**: Enzymes are catalysts that can affect the rate of reactions involving substrates, but they do not directly determine the stability of the substrate itself.

3. **Conclusion**:
- Since stability is directly influenced by energy, and given that higher energy leads to lower stability, the correct answer is **A) Energy**.

### Final Answer:
**A) Energy**