Chromosome is made up of:

Options

A. DNA+pectin
B. RNA+DNA
C. DNA+histone
D. only histone

Answer

**Step-by-Step Text Solution:**

1. **Understanding Chromosome Structure**:
- Chromosomes are structures found in the nucleus of eukaryotic cells. They are composed of DNA and proteins.

2. **Composition of Chromosomes**:
- The primary component of chromosomes is DNA (deoxyribonucleic acid), which carries genetic information.

3. **Role of Histone Proteins**:
- DNA is wrapped around proteins called histones. Histones help in the packaging of DNA into a compact, organized structure.

4. **Histone Protein Details**:
- There are four main types of histone proteins: H2A, H2B, H3, and H4. These histones form an octamer (a complex of eight proteins), around which the DNA is wrapped.

5. **Linking Histone Units**:
- The histone octamers are linked by another histone protein known as H1, which helps in further stabilizing the structure.

6. **Beads on a String Model**:
- The structure of DNA wrapped around histones is often described as a "beads on a string" model, where the beads represent the histone proteins and the string represents the DNA.

7. **Conclusion**:
- Therefore, the correct answer to the question "Chromosome is made up of:" is DNA and histone proteins.

**Final Answer**: Chromosomes are made up of DNA and histone proteins.

---