All the following are the properties of the enzyme t aq polymerase except:

Options

A. It is thermostable DNA polymerase
B. It is isolated from a bacterium, Thermus aquaticticus
C. It is used for amplification of gene of interest using PCR
D. It is thermostable RNA polymerase

Answer

**Step-by-Step Text Solution:**

1. **Understanding Taq Polymerase**: Taq polymerase is an enzyme that is crucial in the Polymerase Chain Reaction (PCR) process, which is used to amplify DNA. It is derived from the bacterium Thermus aquaticus, which thrives in high-temperature environments.

2. **Properties of Taq Polymerase**:
- **Thermostability**: Taq polymerase is known for its thermostability, meaning it can withstand high temperatures without denaturing. This property is essential for PCR, which involves repeated heating and cooling cycles.
- **Source**: It is isolated from the bacterium Thermus aquaticus, which is a thermophilic organism.
- **Function**: Taq polymerase is specifically a DNA polymerase, which means it synthesizes DNA during the PCR process.

3. **Identifying the Incorrect Statement**: The question asks to identify which statement is NOT a property of Taq polymerase. The options provided include:
- It is thermostable DNA polymerase.
- It is isolated from a bacterium, Thermus aquaticus.
- Used for amplification of gene of interest using PCR.
- It is a thermostable RNA polymerase.

4. **Analyzing the Options**:
- The first three statements correctly describe Taq polymerase.
- The fourth statement, "It is a thermostable RNA polymerase," is incorrect because Taq polymerase is a DNA polymerase, not an RNA polymerase.

5. **Conclusion**: Therefore, the property that does not belong to Taq polymerase is that it is a thermostable RNA polymerase.

**Final Answer**: It is a thermostable RNA polymerase.

---