An organism exclusively with 70 's' type of ribosomes contains one of the following .

Options

A. DNA enclosed within the nuclear membrane
B. Circular naked ds DNA
C. Double stranded DNA with histones
D. Single stranded DNA without histones

Answer

To solve the question regarding the organism that exclusively contains 70S type of ribosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Ribosome Types**:
- Ribosomes are classified based on their sedimentation coefficient, measured in Svedberg units (S).
- Prokaryotic cells typically have 70S ribosomes, which are composed of a 50S large subunit and a 30S small subunit.

2. **Identify the Organism Type**:
- Since 70S ribosomes are characteristic of prokaryotic organisms, we can conclude that the organism in question is a prokaryote.

3. **Analyze the Options**:
- **Option 1**: DNA enclosed within the nuclear membrane – This is characteristic of eukaryotic cells, which have a defined nucleus. Therefore, this option is incorrect.
- **Option 2**: Circular Naked Double Stranded DNA – This is typical of prokaryotes, as they usually possess circular DNA that is not associated with histones. This option is likely correct.
- **Option 3**: Double-stranded DNA with histones – This is found in eukaryotic cells where DNA is wrapped around histone proteins. Thus, this option is incorrect.
- **Option 4**: Single-stranded DNA without histones – While some viruses may have single-stranded DNA, this is not typical of prokaryotic organisms. Therefore, this option is also incorrect.

4. **Conclusion**:
- Based on the analysis, the correct answer is **Option 2: Circular Naked Double Stranded DNA**. This is the characteristic DNA structure found in prokaryotes, which aligns with the presence of 70S ribosomes.

### Final Answer:
The organism exclusively with 70S type of ribosomes contains **Circular Naked Double Stranded DNA**.

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