Taq polymerase is isolated from a

Options

A. (a) Virus
B. (b) Bacterium
C. (c) Fungus
D. (d) Protozoan

Answer

**Step-by-Step Solution:**

1. **Identify Taq Polymerase**: Taq polymerase is an enzyme that is crucial in molecular biology, particularly in the Polymerase Chain Reaction (PCR). It is known for its ability to withstand high temperatures.

2. **Source of Taq Polymerase**: Taq polymerase is isolated from a specific type of bacteria. This bacterium is known for thriving in extreme heat conditions, such as those found in hot springs.

3. **Scientific Classification**: The bacterium from which Taq polymerase is derived is called *Thermus aquaticus*. This bacterium is a thermophilic prokaryote, meaning it can survive and reproduce at high temperatures.

4. **Function of Taq Polymerase**: Taq polymerase functions as a DNA polymerase, which is essential for synthesizing new strands of DNA during the PCR process. Its heat-stable nature allows it to remain active even after the high-temperature denaturation step in PCR.

5. **Conclusion**: Based on the information, Taq polymerase is isolated from a bacterium, specifically *Thermus aquaticus*, which is adapted to high-temperature environments.

6. **Final Answer**: Therefore, the correct answer to the question "Taq polymerase is isolated from a" is "bacteria".

---