Which enzyme is isolated from thermophilic bacteria, Thermus aquaticus ?

Options

A. DNA ligase
B. Restriction endonuclease
C. Restriction exonuclease
D. Taq polymerase

Answer

**Step-by-Step Solution:**

1. **Identify the Bacteria**: The question asks about an enzyme isolated from the thermophilic bacteria, Thermus aquaticus.

2. **Understand Thermus aquaticus**: This bacterium is known for its ability to thrive in high-temperature environments, specifically between 72°C and 100°C.

3. **Determine the Enzymes**: The video mentions several enzymes associated with Thermus aquaticus:
- DNA ligase (not associated with Thermus aquaticus)
- Restriction endonuclease (not associated with Thermus aquaticus)
- Exonuclease (not associated with Thermus aquaticus)
- Taq polymerase (associated with Thermus aquaticus)

4. **Identify the Correct Enzyme**: Among the enzymes listed, Taq polymerase is the one that is specifically isolated from Thermus aquaticus. It is a DNA polymerase that is heat-stable, making it ideal for use in polymerase chain reactions (PCR).

5. **Conclusion**: Therefore, the enzyme isolated from thermophilic bacteria, Thermus aquaticus, is Taq polymerase.

**Final Answer**: Taq polymerase

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