The thread-like structures present in the nucleus are

Options

A. nucleolus
B. chromosomes
C. genes
D. ribosomes

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the thread-like structures present in the nucleus of a cell.

2. **Identifying the Options**: The options provided are:
- A) Nucleolus
- B) Chromosomes
- C) Genes
- D) Ribosomes

3. **Analyzing Each Option**:
- **Option A: Nucleolus**: The nucleolus is a dense structure found within the nucleus, primarily involved in the synthesis of ribosomal RNA. It is not thread-like, so this option is incorrect.
- **Option B: Chromosomes**: Chromosomes are indeed thread-like structures that are found in the nucleus. They carry genetic information and are made up of DNA and proteins. This option is correct.
- **Option C: Genes**: Genes are segments of DNA that code for proteins. While they are found on chromosomes, they are not thread-like structures themselves. Therefore, this option is incorrect.
- **Option D: Ribosomes**: Ribosomes are not found in the nucleus; they are the sites of protein synthesis in the cytoplasm. Thus, this option is also incorrect.

4. **Conclusion**: After analyzing all the options, the correct answer is **Chromosomes**, as they are the thread-like structures present in the nucleus.

**Final Answer**: The thread-like structures present in the nucleus are **Chromosomes**.

---