Type of ribosomes present in prokaryotes is

Options

A. 80s
B. 50s
C. 30s
D. 70s

Answer

To answer the question regarding the type of ribosomes present in prokaryotes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ribosome Structure**:
- Ribosomes are cellular structures responsible for protein synthesis. They are made up of ribosomal RNA (rRNA) and proteins.

2. **Identifying Ribosome Types**:
- Ribosomes are classified based on their sedimentation coefficients, measured in Svedberg units (S). The two main types of ribosomes are:
- **Prokaryotic Ribosomes**: These are smaller and consist of two subunits.
- **Eukaryotic Ribosomes**: These are larger and also consist of two subunits.

3. **Ribosome Composition in Prokaryotes**:
- In prokaryotes, the ribosomes are referred to as **70S ribosomes**. This is composed of:
- A smaller subunit (30S) which contains 16S rRNA.
- A larger subunit (50S) which contains 5S rRNA and 23S rRNA.
- Therefore, the combined structure is referred to as 70S (30S + 50S).

4. **Ribosome Composition in Eukaryotes**:
- In contrast, eukaryotic ribosomes are referred to as **80S ribosomes**, which consist of:
- A smaller subunit (40S).
- A larger subunit (60S).

5. **Conclusion**:
- Since the question specifically asks about prokaryotes, the correct answer is **70S ribosomes**.

### Final Answer:
The type of ribosomes present in prokaryotes is **70S ribosomes**.

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