Which organelle is involved in assembling lipid components of the cell membrane and processing materials that are exported from the cell?

• A. Endoplasmic Reticulum
• B. Golgi apparatus
• C. Lysosome
• D. Nucleus

Answer: (A)

The main idea here is how cells build membrane lipids and get materials out of the cell. The endoplasmic reticulum handles both tasks: the smooth ER synthesizes lipid components used to assemble the cell membrane, while the rough ER makes proteins that are destined for export or for membranes. These newly made lipids and proteins are packaged into vesicles and sent toward the Golgi apparatus for further processing and sorting before being transported out of the cell or delivered to their final membranes. Because this organelle is the starting point for lipid synthesis and the initial processing of secretory materials, it best fits the description. (Golgi handles processing and shipping, but it doesn’t synthesize lipids; lysosomes degrade, and the nucleus stores genetic material.)