70 S type of ribosomes found in :-

Options

A. Eukaryotic cells
B. Prokaryotic cells
C. Mitochondria
D. Both B and C

Answer

To solve the question regarding the presence of 70 S type ribosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Ribosome Types**:
- Ribosomes are classified based on their sedimentation rate, measured in Svedberg units (S).
- There are two main types of ribosomes: 70 S and 80 S.

2. **Identify Where 70 S Ribosomes Are Found**:
- 70 S ribosomes are primarily found in prokaryotic cells, which include bacteria and archaea.
- Additionally, 70 S ribosomes are also found in mitochondria and chloroplasts of eukaryotic cells, as these organelles are believed to have originated from prokaryotic ancestors.

3. **Analyze the Options**:
- **Option A**: Eukaryotes - Generally contain 80 S ribosomes in their cytoplasm.
- **Option B**: Prokaryotes - Correct, as they contain 70 S ribosomes.
- **Option C**: Mitochondria - Correct, as they also contain 70 S ribosomes.
- **Option D**: Both B and C - This option combines the correct answers from options B and C.

4. **Select the Correct Answer**:
- Since both prokaryotes and mitochondria contain 70 S ribosomes, the correct answer is **Option D: Both B and C**.

### Final Answer:
**70 S type of ribosomes are found in: Both B (Prokaryotes) and C (Mitochondria).**

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