In every cell, within this nucleus lie the nucleolus and thread-like structures called ______

Options

A. DNA
B. Chromosomes
C. Genes
D. Chromatophores

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the name of the thread-like structures found within the nucleus of a cell, alongside the nucleolus.

2. **Identifying the Components**: In a cell, the nucleus contains two main components: the nucleolus and other structures. The nucleolus is a dense area where ribosomal RNA is produced, while the thread-like structures are crucial for genetic information.

3. **Evaluating Options**:
- **DNA**: This is the genetic material but is not the name of the thread-like structures.
- **Chromosomes**: These are indeed the thread-like structures that contain DNA and are found within the nucleus.
- **Genes**: These are segments of DNA and are not the thread-like structures themselves.
- **Chromatophores**: These are cells that produce color and are unrelated to the nucleus.

4. **Conclusion**: The correct answer is "Chromosomes," as they are the thread-like structures located in the nucleus of a cell.

**Final Answer**: Chromosomes

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