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The rough endoplasmic reticulum (RER) in...

The rough endoplasmic reticulum (RER) in the cells are because of the presense of

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**Step-by-Step Solution:** 1. **Understanding the RER**: The rough endoplasmic reticulum (RER) is a type of endoplasmic reticulum that is involved in the synthesis of proteins. 2. **Naming of RER**: The term "rough" in rough endoplasmic reticulum refers to its appearance. This appearance is due to the presence of ribosomes on its surface. 3. **Role of Ribosomes**: Ribosomes are cellular structures that synthesize proteins. When they are attached to the endoplasmic reticulum, they give it a rough texture. 4. **Conclusion**: Therefore, the rough endoplasmic reticulum is named so because of the presence of ribosomes on its surface, which are essential for protein synthesis. ---
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