Chromosomes in the nucleus of a cell contain thread-like structures called ________ which contain genes

Options

A. DNA
B. nucleolus
C. centrosome
D. chromosomes

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of Chromosomes:**
- Chromosomes are found in the nucleus of a cell. They are thread-like structures that carry genetic information.

2. **Identifying the Components of Chromosomes:**
- Chromosomes are primarily made up of DNA (deoxyribonucleic acid) and proteins. The proteins that help package the DNA are called histones.

3. **Recognizing the Role of DNA:**
- DNA contains the genes, which are the basic units of heredity. These genes carry the instructions for the development, functioning, and reproduction of organisms.

4. **Filling in the Blank:**
- The question asks for the thread-like structures within chromosomes that contain genes. The correct term for these structures is "DNA."

5. **Final Answer:**
- Chromosomes in the nucleus of a cell contain thread-like structures called **DNA**, which contain genes.

---