Which of the following are correct for the cell which has naked ds circular DNA?
(a) Both 70S and 80S ribosome
(b) Histone absent
( c ) Compartmentalisation of cytoplasm absent
(d) Always diploid

Options

A. a and d
B. b and c
C. a and c
D. b and d

Answer

To determine which statements are correct for a cell that has naked double-stranded circular DNA, we will analyze each statement one by one.

1. **Statement A: Both 70S and 80S ribosome are present.**
- **Analysis:**
- 70S ribosomes are typically found in prokaryotic cells, while 80S ribosomes are found in eukaryotic cells. Since a cell with naked double-stranded circular DNA is usually a prokaryotic cell (like bacteria), it would not contain 80S ribosomes. Therefore, this statement is incorrect.

2. **Statement B: Histone absent.**
- **Analysis:**
- In prokaryotic cells, DNA is not associated with histones. Naked double-stranded circular DNA implies that there are no histones present. Thus, this statement is correct.

3. **Statement C: Compartmentalization of cytoplasm absent.**
- **Analysis:**
- Prokaryotic cells do not have membrane-bound organelles, meaning they lack compartmentalization of the cytoplasm. Therefore, this statement is also correct.

4. **Statement D: Always diploid.**
- **Analysis:**
- Prokaryotic cells typically have a single circular chromosome, making them haploid rather than diploid. Therefore, this statement is incorrect.

**Conclusion:**
- The correct statements are B (Histone absent) and C (Compartmentalization of cytoplasm absent). Thus, the answer is option B.

### Summary of the Solution:
- Statement A is incorrect.
- Statement B is correct.
- Statement C is correct.
- Statement D is incorrect.
- The correct answer is option B (B and C are correct).