Chromatin is composed of

Options

A. DNA+histone
B. DNA+RNA+histone
C. DNA+small amounts of RNA
D. DNA+RNA+histone and nonhistone proteins.

Answer

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

1. **Understanding Chromatin**: Chromatin is a complex of DNA and proteins found in the nucleus of eukaryotic cells. It plays a crucial role in packaging DNA into a more compact, dense shape.

2. **Components of Chromatin**: Chromatin is primarily composed of DNA and proteins. The proteins involved are mainly histones, which are positively charged and help in the organization of the negatively charged DNA.

3. **Formation of Nucleosomes**: The basic unit of chromatin is the nucleosome, which consists of a segment of DNA wound around a core of histone proteins. This structure helps in the compaction of DNA.

4. **Analyzing the Options**:
- **Option A**: DNA plus histone - This is a correct representation of chromatin's primary components.
- **Option B**: DNA plus RNA plus histone - This is incorrect as RNA is not a primary component of chromatin.
- **Option C**: DNA plus small amount of RNA - This is also incorrect as chromatin does not primarily consist of RNA.
- **Option D**: DNA plus RNA plus histone and non-histone proteins - This is incorrect as well, since while there are non-histone proteins, RNA is not a significant component of chromatin.

5. **Conclusion**: Based on the analysis, the correct answer is **Option A: DNA plus histone**. Chromatin is primarily composed of a DNA-histone complex, where DNA is wrapped around histone proteins.