The nature of DNA replication is :-

Options

A. Conservation
B. Non conservative
C. Semi-conservative
D. Cyanobacteria

Answer

**Step-by-Step Text Solution:**

1. **Understanding DNA Replication:**
- DNA replication is the biological process by which a cell duplicates its DNA, resulting in two identical copies from one original DNA molecule.

2. **Identifying the Options:**
- The options provided are:
- A) Conservative
- B) Non-conservative
- C) Semi-conservative
- D) Cyanobacteria

3. **Analyzing the Options:**
- **Cyanobacteria** is a type of microorganism and does not pertain to the nature of DNA replication. Therefore, it is an incorrect option.
- **Conservative replication** suggests that the original DNA molecule remains intact and a completely new molecule is formed. This is not the case in DNA replication.
- **Non-conservative replication** would imply that both strands of the original DNA are completely broken down and not retained in any form. This is also incorrect.

4. **Understanding Semi-Conservative Replication:**
- In semi-conservative replication, each of the two new DNA molecules consists of one original (parent) strand and one newly synthesized strand. This means that half of the original DNA is conserved in each of the daughter molecules.
- For example, if the original strand is represented as green and the newly synthesized strand as red, one daughter strand will have a green (parent) strand and a red (new) strand.

5. **Conclusion:**
- Based on the analysis, the correct nature of DNA replication is **semi-conservative**. This was first demonstrated by scientists Meselson and Stahl.

**Final Answer:**
The nature of DNA replication is **semi-conservative**.

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