Which structure is the site of the synthesis of proteins that may be exported from the cell?

• A. Smooth Endoplasmic Reticulum
• B. Golgi Apparatus
• C. Rough Endoplasmic Reticulum
• D. Lysosome

Answer: (C)

Verified step by step guidance

1. Begin by understanding the function of each cellular structure mentioned in the problem. The Smooth Endoplasmic Reticulum is primarily involved in lipid synthesis and detoxification processes.
2. Next, consider the Golgi Apparatus, which is responsible for modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles.
3. The Lysosome is an organelle containing digestive enzymes that break down waste materials and cellular debris.
4. Focus on the Rough Endoplasmic Reticulum (RER), which is characterized by the presence of ribosomes on its surface. These ribosomes are the sites of protein synthesis.
5. Proteins synthesized by ribosomes on the Rough Endoplasmic Reticulum are often destined for export out of the cell or for use in the cell membrane. This is because the RER is involved in the initial stages of protein processing and transport.