Which of the following does not show a circular DNA?

Options

A. Bacterial cell
B. Nucleus
C. Mitochondria
D. Chloroplast

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which of the given options does not show circular DNA. We need to analyze each option to determine the presence or absence of circular DNA.

2. **Analyzing the Options**:
- **Bacterial Cell**: Bacteria are prokaryotic cells, and they typically contain circular DNA. This is a characteristic feature of prokaryotes. Therefore, this option shows circular DNA.

- **Nucleus**: The nucleus is found in eukaryotic cells and contains linear DNA (chromosomal DNA). Thus, the nucleus does not show circular DNA.

- **Mitochondria**: Mitochondria, which are organelles found in eukaryotic cells, contain their own DNA known as mitochondrial DNA, which is circular. Therefore, this option shows circular DNA.

- **Chloroplast**: Similar to mitochondria, chloroplasts also have their own DNA, which is circular. Thus, this option shows circular DNA as well.

3. **Conclusion**: After analyzing all the options, we find that the only option that does not show circular DNA is the **nucleus**.

4. **Final Answer**: The correct answer is **Nucleus**.

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