AIIMS 2019 Biology Endoplasmic Reticulum MCQ Question

The synthesis of lipids primarily occurs in the smooth endoplasmic reticulum (SER), not the Golgi body, which is involved in the modification, sorting, and packaging of proteins and lipids. While the rough endoplasmic reticulum (RER) is associated with protein synthesis due to its ribosomes, it does not play a significant role in lipid synthesis. Mitochondria are primarily involved in energy production through oxidative phosphorylation rather than lipid biosynthesis. Thus, the SER is the key organelle for lipid synthesis, facilitating the production of phospholipids and cholesterol essential for membrane formation and cellular function.