Function of RER is

Options

A. Autolysis
B. Lipid synthesis
C. Protein synthesis
D. Carbohydrate synthesis

Answer

### Step-by-Step Solution:

1. **Understanding RER**: The first step is to identify what RER stands for. RER is the abbreviation for Rough Endoplasmic Reticulum.

2. **Types of Endoplasmic Reticulum**: Recognize that there are two types of Endoplasmic Reticulum: Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER). The RER is characterized by the presence of ribosomes on its surface.

3. **Function of RER**: The primary function of the Rough Endoplasmic Reticulum is related to protein synthesis. The ribosomes attached to the RER are the sites where proteins are synthesized.

4. **Role in Protein Transport**: After proteins are synthesized on the ribosomes, the RER also plays a role in transporting these proteins to other parts of the cell or for secretion outside the cell.

5. **Conclusion**: Based on the functions described, the final answer to the question "Function of RER is" is **protein synthesis**.