Which organelle synthesizes lipids for the cell membrane and other parts of the cell?

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

Answer: (A)

The smooth endoplasmic reticulum is the site where lipids are made, including the phospholipids and cholesterol that make up cell membranes. It lacks ribosomes, so its role isn’t to synthesize proteins but to assemble lipid molecules and help distribute them to membranes throughout the cell. The rough endoplasmic reticulum, by contrast, is studded with ribosomes and specializes in protein synthesis for secretion and membrane insertion. The nucleus contains genetic material, not lipid synthesis, and the Golgi apparatus mainly processes and packages lipids and proteins after they’re made. So, the smooth ER is the best answer because it is specifically dedicated to producing lipids for membranes and other cellular components.