AIIMS 2018 Botany Endoplasmic Reticulum MCQ Question

The smooth endoplasmic reticulum (SER) is primarily responsible for the synthesis of lipids, including phospholipids and cholesterol, which are essential for cell membrane formation and function. It also plays a role in carbohydrate metabolism, particularly in the synthesis of glycogen. In contrast, the rough endoplasmic reticulum (RER) is involved in protein synthesis due to its ribosome-studded surface, while ribosomes themselves are the sites of protein translation and do not directly synthesize lipids or carbohydrates. Lysosomes are primarily involved in the degradation of macromolecules rather than their synthesis.