DNA polymerases I and II are generally used in DNA replication

Options

A. to cut the helix at certain places
B. for proof reading & repair
C. adding carbonyl compound
D. breaking and joining pieces of one DNA strand

Answer

To answer the question regarding the roles of DNA polymerases I and II in DNA replication, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding DNA Polymerases**:
- DNA polymerases are enzymes that synthesize DNA molecules from deoxyribonucleotides, the building blocks of DNA. In prokaryotes, there are three main types: DNA polymerase I, II, and III.

2. **Role of DNA Polymerase I**:
- DNA polymerase I is primarily known as a repair enzyme. It plays a crucial role in proofreading during DNA replication. This means it can remove incorrectly paired nucleotides and replace them with the correct ones using the template strand.

3. **Role of DNA Polymerase II**:
- DNA polymerase II is also involved in DNA repair processes. It is considered a minor repair enzyme and assists in the proofreading mechanism, ensuring the fidelity of DNA replication.

4. **Conclusion on Functions**:
- Both DNA polymerase I and II are essential for the proofreading and repair of DNA during replication. They help maintain the integrity of the genetic information by correcting errors that may occur during DNA synthesis.

5. **Final Answer**:
- Therefore, the correct answer to the question is that DNA polymerases I and II are generally used for proofreading and repair of DNA during the process of DNA replication.