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Ribosomes of prokaryotes are :-...

Ribosomes of prokaryotes are :-

A

10 s

B

20 s

C

70 s

D

80 s

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**Step-by-Step Solution:** 1. **Understanding Ribosomes**: Ribosomes are cellular structures responsible for protein synthesis. They can be found in both prokaryotic and eukaryotic cells, but their size and composition differ between these two types of organisms. 2. **Identifying Prokaryotic Ribosomes**: Prokaryotes, which include bacteria and blue-green algae, do not have membrane-bound organelles. Their ribosomes are found freely in the cytoplasm. 3. **Size of Prokaryotic Ribosomes**: The ribosomes of prokaryotes are classified based on their sedimentation rate, measured in Svedberg units (S). Prokaryotic ribosomes are known to be 70S in size. 4. **Subunits of Prokaryotic Ribosomes**: The 70S ribosomes in prokaryotes are composed of two subunits: a larger subunit (50S) and a smaller subunit (30S). This composition is crucial for their function in protein synthesis. 5. **Eliminating Incorrect Options**: Given the options of 10S, 20S, 70S, and 80S: - 10S and 20S are not associated with prokaryotic ribosomes. - 80S ribosomes are characteristic of eukaryotic cells. - Therefore, the only correct option is 70S. 6. **Conclusion**: The ribosomes of prokaryotes are 70S, consisting of 50S and 30S subunits. **Final Answer**: The ribosomes of prokaryotes are 70S. ---
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