Chromosomes composed of :-

Options

A. DNA, RNA, Histones, Non histones
B. DNA and Histones
C. DNA and RNA
D. DNA, RNA and Histones

Answer

**Step-by-Step Solution:**

1. **Understanding Chromosomes**: Chromosomes are structures within cells that contain genetic material. They are crucial for the storage and transmission of genetic information.

2. **Composition of Chromosomes**: The primary components of chromosomes are DNA and proteins.

3. **Role of DNA**: DNA, which stands for deoxyribonucleic acid, is the molecule that carries the genetic instructions. In eukaryotic organisms, DNA is organized into a double helical structure.

4. **Histone Proteins**: DNA in chromosomes is wrapped around proteins called histones. These proteins help in organizing and compacting the DNA into a structure that can fit within the cell nucleus.

5. **Types of Histones**: The core histone proteins include H2A, H2B, H3, and H4. These histones form an octamer, around which the DNA is wrapped. Additionally, there is a linker histone known as H1, which helps in further compaction of the DNA.

6. **Final Composition**: Therefore, chromosomes are composed of DNA and histone proteins, which together facilitate the packaging and organization of genetic material within the cell.

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

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