Which of the following cells do not show DNA duplication or RNA sythesis ?

Options

A. Liver cells
B. Muscle cells
C. Nerver cells
D. Mature RBCs

Answer

To determine which of the following cells do not show DNA duplication or RNA synthesis, we need to analyze the options provided: liver cells, muscle cells, nerve cells, and mature red blood cells (RBCs).

### Step-by-Step Solution:

1. **Understanding DNA Duplication and RNA Synthesis**:
- DNA duplication occurs in the nucleus of the cell, where the genetic material is housed.
- RNA synthesis also takes place in the nucleus, as RNA is transcribed from DNA.

2. **Analyzing the Cell Types**:
- **Liver Cells (Hepatocytes)**: These cells have a nucleus and are capable of both DNA duplication and RNA synthesis.
- **Muscle Cells**: Muscle cells also contain a nucleus, allowing for DNA duplication and RNA synthesis.
- **Nerve Cells**: Nerve cells (neurons) have a nucleus as well, which means they can perform DNA duplication and RNA synthesis.
- **Mature Red Blood Cells (RBCs)**: Mature RBCs are unique in that they do not contain a nucleus. This absence of a nucleus means that mature RBCs cannot undergo DNA duplication or RNA synthesis.

3. **Conclusion**:
- Among the options provided, the only cell type that does not show DNA duplication or RNA synthesis is the **mature red blood cell (RBC)**.

### Final Answer:
The correct answer is **mature RBC**.

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