which is an enzyme that joins two segments of replicated DNA?

Options

A. Ligases
B. Lyase
C. Endonuclease
D. Topoisomerases

Answer

To answer the question, "Which is an enzyme that joins two segments of replicated DNA?" we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Function of Each Enzyme**:
- **Ligase**: This enzyme catalyzes the joining of two large molecules by forming new chemical bonds, typically through hydrolysis. It is specifically involved in joining segments of DNA.
- **Lyase**: This enzyme catalyzes the breaking of various chemical bonds, often forming new double bonds or ring structures. It does not join segments.
- **Endonuclease**: This enzyme cleaves the phosphodiester bonds within a polynucleotide chain. It is involved in cutting DNA rather than joining it.
- **Topoisomerase**: This enzyme prevents the DNA double helix from becoming too tightly wound during replication but does not join DNA segments.

2. **Determine the Correct Answer**:
- Since ligase is the enzyme that specifically joins two segments of DNA, it is the correct answer to the question.

3. **Conclusion**:
- The enzyme that joins two segments of replicated DNA is **Ligase**.

### Final Answer:
**Ligase**

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