During DNA replication, Okazaki fragments are used to elongate :

Options

A. The lagging strand towards replication fork.
B. The leading strand away from replication fork.
C. The leading strand away from the replication fork.
D. The leading strand towards replication fork.

Explanation

### Step-by-Step Solution:

1. **Understanding DNA Replication**: DNA replication involves the synthesis of two new strands from the original DNA double helix. This process occurs in a semi-conservative manner, meaning each new DNA molecule consists of one old strand and one new strand.

2. **Identifying the Strands**: During replication, there are two strands being synthesized:
- The **leading strand**, which is synthesized continuously in the direction of the replication fork.
- The **lagging strand**, which is synthesized discontinuously in the opposite direction of the replication fork.

3. **Role of Okazaki Fragments**: Okazaki fragments are short sequences of DNA nucleotides (approximately 150 to 200 nucleotides long) that are synthesized on the lagging strand. These fragments are produced because DNA polymerase can only add nucleotides in the 5' to 3' direction, leading to the formation of these short segments as the replication fork opens up.

4. **Formation of the Lagging Strand**: As the replication fork progresses, the lagging strand is synthesized in segments (Okazaki fragments) away from the fork. These fragments are later joined together by the enzyme DNA ligase to form a continuous strand.

5. **Conclusion**: Based on the understanding of the replication process and the role of Okazaki fragments, we conclude that Okazaki fragments are used to elongate the **lagging strand** away from the replication fork.

### Final Answer:
Okazaki fragments are used to elongate the **lagging strand away from the replication fork**.

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