70s and 80s ribosomes both are present in

Options

A. Mitochondria
B. Chloroplast
C. Prokaryotic cells
D. Eukaryotic cells

Answer

To answer the question regarding where both 70s and 80s ribosomes are present, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ribosomes**:
- Ribosomes are cellular structures essential for protein synthesis. They are composed of ribosomal RNA (rRNA) and proteins.

2. **Types of Ribosomes**:
- There are two types of ribosomes based on their sedimentation rates:
- **70s Ribosomes**: Found in prokaryotes and in the mitochondria and chloroplasts of eukaryotic cells. They are made up of two subunits: 50s and 30s.
- **80s Ribosomes**: Found in eukaryotic cells, specifically in the cytoplasm and on the endoplasmic reticulum. They consist of 40s and 60s subunits.

3. **Identifying Locations**:
- **Mitochondria**: Present in both plant and animal cells, contain 70s ribosomes.
- **Chloroplasts**: Found in plant cells, also contain 70s ribosomes.
- **Prokaryotic Cells**: Only contain 70s ribosomes.
- **Eukaryotic Cells**: Contain both 70s ribosomes (in mitochondria) and 80s ribosomes (in the cytoplasm and on the endoplasmic reticulum).

4. **Conclusion**:
- The only type of cell that contains both 70s and 80s ribosomes is the **eukaryotic cell**.

### Final Answer:
Both 70s and 80s ribosomes are present in **eukaryotic cells**.

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