Prokaryotic Ribosomes are

Options

A. 50 S
B. 60 S
C. 70 S
D. 80 S

Answer

### Step-by-Step Solution:

1. **Understanding Ribosomes**: Ribosomes are essential cellular structures responsible for protein synthesis. They are found in both prokaryotic and eukaryotic cells.

2. **Identifying Prokaryotic Ribosomes**: In prokaryotic cells, ribosomes are classified based on their sedimentation rate, measured in Svedberg units (S).

3. **Sedimentation Rates of Ribosomal Subunits**: Prokaryotic ribosomes are composed of two subunits:
- The larger subunit is 50S.
- The smaller subunit is 30S.
- Together, these form a complete ribosome with a total size of 70S.

4. **Evaluating the Options**: The options provided are:
- 50S
- 60S
- 70S
- 80S

5. **Analyzing Each Option**:
- **50S**: This is the size of the larger subunit, not the complete ribosome.
- **60S**: This size is not present in prokaryotes.
- **70S**: This is the correct answer as it represents the complete ribosome in prokaryotes.
- **80S**: This size is characteristic of eukaryotic ribosomes, not prokaryotic.

6. **Conclusion**: The correct answer to the question "Prokaryotic Ribosomes are" is **70S**.

### Final Answer:
**70S**

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