Eukaryotic chromosomes are composed of
(a) DNA + Protein
(b) DNA + RNA
(c) RNA + Protein
(d) Only DNA

Options

A. DNA + Protein
B. DNA + RNA
C. RNA + Protein
D. Only DNA

Answer

To solve the question regarding the composition of eukaryotic chromosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Eukaryotic Chromosomes**:
- Eukaryotic chromosomes are structures that carry genetic material.

2. **Identify the Genetic Material in Eukaryotes**:
- In eukaryotes, the genetic material is primarily DNA (deoxyribonucleic acid).

3. **Consider the Role of Proteins**:
- DNA alone cannot form chromosomes. It needs to be packaged properly. This is where proteins come into play.
- The proteins involved in this packaging are known as histones and non-histone proteins.

4. **Evaluate the Options**:
- **Option (a)**: DNA + Protein - This is correct as eukaryotic chromosomes are composed of both DNA and proteins.
- **Option (b)**: DNA + RNA - This is incorrect because RNA is not a component of chromosomes in eukaryotes.
- **Option (c)**: RNA + Protein - This is also incorrect as RNA does not constitute the chromosomes in eukaryotic cells.
- **Option (d)**: Only DNA - This is incorrect since chromosomes require proteins for their structure.

5. **Conclusion**:
- Based on the analysis, the correct answer is **(a) DNA + Protein**.

### Final Answer:
Eukaryotic chromosomes are composed of **(a) DNA + Protein**.

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