The biomolecules synthesis by the rough endoplasmic reticulum are modified here before being released.

Options

A. Golgi complex
B. vacuoles
C. lysosomes
D. peroxysomes

Answer

To answer the question regarding where the biomolecules synthesized by the rough endoplasmic reticulum are modified before being released, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Role of the Rough Endoplasmic Reticulum (RER)**:
- The rough endoplasmic reticulum is primarily involved in the synthesis of proteins. It has ribosomes on its surface, which give it a "rough" appearance.

2. **Understand the Process After Synthesis**:
- Once proteins are synthesized in the RER, they do not get released immediately. Instead, they are transported to another organelle for further processing.

3. **Identify the Organelle for Modification**:
- The next organelle that the proteins move to is the Golgi complex (or Golgi apparatus). This organelle is responsible for modifying, sorting, and packaging proteins for secretion or for use within the cell.

4. **Confirm the Function of the Golgi Complex**:
- In the Golgi complex, proteins undergo various modifications, such as glycosylation (addition of sugar molecules), phosphorylation, and other chemical changes. After these modifications, the proteins are packaged into vesicles for transport.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the biomolecules synthesized by the rough endoplasmic reticulum are modified in the Golgi complex before being released.

### Final Answer:
The biomolecules synthesized by the rough endoplasmic reticulum are modified in the **Golgi complex** before being released.

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