Replication is continuous in :-

Options

A. The leading strand
B. The lagging strand
C. Strand where okazaki fragments are present
D. Both (2) & (3)

Answer

To answer the question "Replication is continuous in:", we will analyze the process of DNA replication and identify which strand exhibits continuous replication.

### Step-by-Step Solution:

1. **Understanding DNA Structure**: DNA is composed of two strands that run in opposite directions, known as antiparallel strands. Each strand has a 5' (five prime) end and a 3' (three prime) end.

2. **Direction of Replication**: DNA replication occurs in the 5' to 3' direction. This means that new nucleotides are added to the 3' end of the growing strand.

3. **Leading and Lagging Strands**: During DNA replication, one strand is synthesized continuously while the other is synthesized in short segments.
- The **leading strand** is synthesized continuously in the direction of the replication fork.
- The **lagging strand** is synthesized in short segments called Okazaki fragments, as it runs in the opposite direction to the replication fork.

4. **Role of RNA Primers**: The leading strand requires only one RNA primer to initiate replication, whereas the lagging strand requires multiple RNA primers for each Okazaki fragment.

5. **Conclusion**: Since the leading strand is synthesized continuously without the formation of Okazaki fragments, the answer to the question is that replication is continuous in the **leading strand**.

### Final Answer:
Replication is continuous in the **leading strand**.