Circular DNA, RNA fragments and 70S ribosomes are seen in

Options

A. ER
B. Mitochondria
C. Chloroplast
D. Both (2) and (3)

Answer

To answer the question regarding where circular DNA, RNA fragments, and 70S ribosomes are found, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Components**:
- **Circular DNA**: This type of DNA is typically found in prokaryotic cells and in some organelles of eukaryotic cells, such as mitochondria and chloroplasts.
- **RNA Fragments**: RNA can be found in various forms in cells, including mRNA, tRNA, and rRNA. In organelles, RNA is often involved in protein synthesis.
- **70S Ribosomes**: These ribosomes are characteristic of prokaryotic cells and are also found in mitochondria and chloroplasts, which are believed to have evolved from prokaryotic ancestors.

2. **Analyzing the Options**:
- **Option 1: Endoplasmic Reticulum (ER)**: The ER does not contain circular DNA or 70S ribosomes. It is involved in protein and lipid synthesis but does not have the features mentioned in the question.
- **Option 2: Mitochondria**: Mitochondria contain circular DNA, RNA fragments, and 70S ribosomes. They are semi-autonomous organelles that perform cellular respiration.
- **Option 3: Chloroplast**: Like mitochondria, chloroplasts also contain circular DNA, RNA fragments, and 70S ribosomes. They are involved in photosynthesis.
- **Option 4: Both Mitochondria and Chloroplast**: Since both organelles have the features mentioned in the question, this option is also correct.

3. **Conclusion**:
- The correct answer is **Option 4: both mitochondria and chloroplast**. Both organelles are semi-autonomous and possess circular DNA, RNA fragments, and 70S ribosomes.

### Final Answer:
**Both mitochondria and chloroplast** (Option 4) are the correct answers as they contain circular DNA, RNA fragments, and 70S ribosomes.

---