Ratio of DNA: Histone is roughly 1:1 in eukaryotic chromosome. In prokaryotes it is

Options

A. `1:2`
B. `2:1`
C. `1:0`
D. `2:0`

Answer

To solve the question regarding the ratio of DNA to histone in prokaryotic organisms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Eukaryotic Chromosomes**:
- In eukaryotic cells, DNA is tightly packed with histone proteins to form a structure known as chromatin. The ratio of DNA to histone in eukaryotic chromosomes is approximately 1:1.

2. **Identify the Key Differences Between Eukaryotes and Prokaryotes**:
- Eukaryotes have a well-defined nucleus where DNA is organized into chromosomes.
- Prokaryotes, on the other hand, lack a defined nucleus. Their DNA is not organized into chromosomes but is instead found in a region called the nucleoid.

3. **Analyze the Presence of Histones in Prokaryotes**:
- Prokaryotic cells generally do not contain histone proteins. Instead, their DNA is usually circular and exists as a single chromosome that is not wrapped around histones.

4. **Determine the Ratio of DNA to Histone in Prokaryotes**:
- Since prokaryotes do not have histones, the amount of histone present is essentially zero. Therefore, the ratio of DNA to histone in prokaryotic cells can be expressed as:
- DNA: 1 (as there is DNA present)
- Histone: 0 (as there are no histones)
- This gives us a ratio of 1:0.

### Final Answer:
The ratio of DNA to histone in prokaryotic organisms is 1:0.

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