Surface of endoplamic reticulum is covered with

Options

A. Glucose
B. DNA
C. Ribosomes
D. RNA

Answer

**Step-by-Step Solution:**

1. **Understanding the Endoplasmic Reticulum (ER):**
- The endoplasmic reticulum is a membrane-bound organelle found in eukaryotic cells. It plays a crucial role in the synthesis and transport of proteins and lipids.

2. **Types of Endoplasmic Reticulum:**
- There are two types of endoplasmic reticulum: Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).
- The Rough Endoplasmic Reticulum is characterized by the presence of ribosomes on its surface, giving it a "rough" appearance.
- The Smooth Endoplasmic Reticulum lacks ribosomes, which is why it appears smooth.

3. **Function of Ribosomes:**
- Ribosomes are the sites of protein synthesis. In the context of the Rough Endoplasmic Reticulum, they are essential for translating mRNA into proteins.

4. **Analyzing the Options:**
- The question asks what covers the surface of the endoplasmic reticulum.
- The options provided are glucose, DNA, ribosomes, and RNA.
- Since ribosomes are present on the surface of the Rough Endoplasmic Reticulum, this option is correct.

5. **Conclusion:**
- The surface of the endoplasmic reticulum, specifically the Rough Endoplasmic Reticulum, is covered with ribosomes.

**Final Answer:**
The surface of the endoplasmic reticulum is covered with **ribosomes**.

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