The thermostable enzyme , ''Taq'' and ''Pfu'', is isolated from thermophilic bacteria are :

Options

A. RNA polymerase
B. DNA primers
C. DNA polymerases
D. DNA ligase

Answer

To solve the question regarding the thermostable enzymes "Taq" and "Pfu" isolated from thermophilic bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Enzymes**: The question mentions two specific enzymes, Taq and Pfu. Both of these enzymes are known for their stability at high temperatures.

2. **Understand the Source**: Taq and Pfu are derived from thermophilic bacteria. Thermophilic bacteria thrive in high-temperature environments, which is why their enzymes are heat-stable.

3. **Determine the Function of the Enzymes**: Taq and Pfu are primarily used in molecular biology techniques, particularly in the Polymerase Chain Reaction (PCR). This technique amplifies DNA, which requires a specific type of enzyme.

4. **Identify the Type of Enzyme**: Both Taq and Pfu are classified as DNA polymerases. DNA polymerases are enzymes that synthesize DNA molecules from nucleotides, the building blocks of DNA.

5. **Evaluate the Options**: The options provided are:
- A) RNA polymerase
- B) DNA primer
- C) DNA polymerase
- D) DNA ligase

Based on our understanding:
- RNA polymerase is incorrect because Taq and Pfu are not RNA polymerases.
- A DNA primer is not an enzyme; it is a short strand of nucleic acid that provides a starting point for DNA synthesis.
- DNA polymerase is correct, as both Taq and Pfu are DNA polymerases.
- DNA ligase is also incorrect because it is an enzyme that joins DNA fragments, not the type of enzyme we are discussing.

6. **Conclusion**: The correct answer is option C, DNA polymerase.

### Final Answer:
The thermostable enzymes "Taq" and "Pfu" are isolated from thermophilic bacteria and are classified as **DNA polymerases**.

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