DNA replication in eukaryotic organisms is

Options

A. Semi-discontinuous with single ori
B. Semi-conservation and semi-discontinuous
C. Semi-conservation with single ori
D. Conservation and bidirectional

Answer

**Step-by-Step Solution:**

1. **Understanding DNA Replication:**
- DNA replication is the process by which a cell makes an identical copy of its DNA. This process is crucial for cell division and the maintenance of genetic information.

2. **Characteristics of Eukaryotic DNA Replication:**
- In eukaryotic organisms, DNA replication has specific characteristics that differentiate it from prokaryotic replication.

3. **Semi-Conservative Nature:**
- DNA replication is described as semi-conservative. This means that each new DNA molecule consists of one original (parental) strand and one newly synthesized strand. This ensures that genetic information is preserved in each generation of cells.

4. **Semi-Discontinuous Replication:**
- The term semi-discontinuous refers to the way replication occurs on the two strands of the DNA double helix.
- The leading strand (3' to 5' direction) is synthesized continuously, allowing for a smooth replication process.
- The lagging strand (5' to 3' direction) is synthesized discontinuously in short segments known as Okazaki fragments. These fragments are later joined together by the enzyme DNA ligase.

5. **Conclusion:**
- Therefore, the correct description of DNA replication in eukaryotic organisms is that it is both semi-conservative and semi-discontinuous.

**Final Answer:**
DNA replication in eukaryotic organisms is semi-conservative and semi-discontinuous.

---