In prokaryotes cells, ribosomes are present

Options

A. In cytoplasm
B. In mitochondria
C. in plastids
D. All

Answer

### Step-by-Step Solution:

1. **Understanding Ribosomes**: Ribosomes are granular structures that play a crucial role in protein synthesis. They are composed of ribonucleic acid (RNA) and proteins.

2. **Location of Ribosomes in Cells**: Ribosomes are found in both prokaryotic and eukaryotic cells. However, their structure differs slightly between these two types of cells.

3. **Ribosome Size**: In prokaryotic cells, ribosomes are referred to as 70S ribosomes, while in eukaryotic cells, they are called 80S ribosomes. The "S" refers to the Svedberg unit, which indicates the size and density of the ribosomes.

4. **Prokaryotic Cell Characteristics**: Prokaryotic cells lack membrane-bound organelles, such as a nucleus, mitochondria, and plastids. This is an important distinction when considering where ribosomes are located.

5. **Location of Ribosomes in Prokaryotes**: In prokaryotic cells, ribosomes are found freely floating in the cytoplasm. They are not associated with any membrane-bound organelles since prokaryotes do not possess these structures.

6. **Conclusion**: Therefore, the correct answer to the question of where ribosomes are present in prokaryotic cells is that they are located in the cytoplasm.

### Final Answer:
In prokaryotic cells, ribosomes are present in the cytoplasm.

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