_____ is thus an important quality of those enzymes which isolated from thermophilic organisms.

Answer

**Step-by-Step Solution:**

1. **Understanding Thermophilic Organisms**:
- Thermophilic organisms are those that thrive in high-temperature environments. They are adapted to survive and grow only at elevated temperatures, which means they have special adaptations in their cellular structures and metabolic processes.

2. **Enzymes from Thermophilic Organisms**:
- The enzymes produced by thermophilic organisms are unique because they must function optimally at high temperatures. This leads to the production of enzymes that are stable and functional under these conditions.

3. **Key Quality of Thermophilic Enzymes**:
- The critical quality of enzymes from thermophilic organisms is their ability to remain stable and active at high temperatures. This property is referred to as "thermostability."

4. **Example of a Thermostable Enzyme**:
- A well-known example of a thermostable enzyme is Taq polymerase, which is a DNA polymerase used in the polymerase chain reaction (PCR). It is isolated from the bacterium Thermus aquaticus, which is a thermophilic organism.

5. **Final Answer**:
- Therefore, the important quality of enzymes isolated from thermophilic organisms is **thermostability**.

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