The process in which strands of melted DNA hybridise on cooling is known as

Options

A. Melting
B. Freezing
C. Annealing
D. Denaturation

Answer

To solve the question, "The process in which strands of melted DNA hybridize on cooling is known as," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding DNA Structure**:
- DNA exists as a double helix structure composed of two strands that are held together by hydrogen bonds between complementary bases.

2. **Denaturation of DNA**:
- When DNA is heated, the hydrogen bonds between the strands break, leading to the separation of the two strands. This process is known as **denaturation**.

3. **Cooling the Denatured DNA**:
- After denaturation, if the temperature is lowered (cooled), the separated strands can come back together. This is because the complementary bases on the two strands will find each other and re-establish hydrogen bonds.

4. **Hybridization Process**:
- The process of the two separated strands of DNA coming back together upon cooling is referred to as **annealing**. During this process, the strands hybridize, forming a double-stranded structure again.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the process in which strands of melted DNA hybridize on cooling is known as **annealing**.

### Final Answer:
The process in which strands of melted DNA hybridize on cooling is known as **annealing**.

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