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Which organelle is primarily responsible for the synthesis of lipids and the detoxification of drugs and poisons in a eukaryotic cell?
Rough Endoplasmic Reticulum
Smooth Endoplasmic Reticulum
Golgi Apparatus
Lysosome
Smooth Endoplasmic Reticulum
The Smooth Endoplasmic Reticulum (SER) is a membrane-bound organelle that lacks ribosomes, distinguishing it from the Rough Endoplasmic Reticulum (RER). It specializes in lipid biosynthesis, steroid hormone production, and the detoxification of metabolic wastes and exogenous toxins.
The Smooth Endoplasmic Reticulum (SER) is a membrane-bound organelle that lacks ribosomes, distinguishing it from the Rough Endoplasmic Reticulum (RER). It specializes in lipid biosynthesis, steroid hormone production, and the detoxification of metabolic wastes and exogenous toxins.
If the cell were a house, the SER acts like a versatile 'chemistry workshop' that manufactures household maintenance supplies (lipids) and processes dangerous chemical waste to ensure the home remains safe.
SER = Synthesis (of lipids), Excretion/Detoxification, and Regularizing metabolism.
RтИТOH+DrugP450тАЛRтИТOтИТH+Metabolite тАФ generalized detoxification reaction representing chemical modification.
The SER contains embedded enzymes that catalyze the synthesis of phospholipids, cholesterol, and glycerolipids. For detoxification, the SER houses the cytochrome P450 family of enzymes, which oxidize lipid-soluble drugs and toxic compounds, rendering them more water-soluble for excretion by the cell.
SER is tubular in structure, whereas RER is cisternae-like.
SER is the primary site for steroid synthesis in endocrine cells (e.g., testes and ovaries).
In muscle cells, a specialized SER called the sarcoplasmic reticulum regulates calcium ion Ca2+ storage.
Detoxification processes are highly active in hepatocytes (liver cells) where the SER is abundant.
Production of phospholipids for cell membrane repair.
Drug metabolism and detox in the human liver.
| Feature | Rough ER | Smooth ER |
|---|---|---|
Ribosome Presence | Present | Absent |
Primary Function | Protein Synthesis | Lipid Synthesis/Detox |
The cytochrome P450 enzymes operate via oxidative metabolism to increase the hydrophilicity of toxins.
Option A (Rough ER) is associated with protein synthesis due to attached ribosomes.
Option C (Golgi) focuses on packaging and modification of proteins.
Option D (Lysosome) contains hydrolytic enzymes for intracellular digestion.
B is correct тАФ The Smooth Endoplasmic Reticulum is specialized for lipid synthesis and the enzymatic detoxification of harmful substances.
Remember: 'Rough' means protein factory (ribosomes), while 'Smooth' means lipid factory and detox center. This distinction is a high-yield topic for NEET and UPSC biology.