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Which is the important site of formation of glycoproteins and glycolipids in eukaryotic cells?
The Golgi apparatus is the primary post-translational processing organelle where proteins and lipids undergo glycosylation to form glycoproteins and glycolipids! Golgi bodies are the site of glycoprotein and glycolipid formation. Select Option (3) in 5 seconds.
First observed by Camillo Golgi in 1898, the Golgi complex consists of stacked, curved cisternae arranged concentrically near the nucleus with a convex *cis* (forming) face and a concave *trans* (maturing) face: - Post-Translational Glycosylation: Proteins translated on rough endoplasmic reticulum (RER) ribosomes and lipids synthesized in smooth endoplasmic reticulum (SER) bud off as transport vesicles that fuse with the *cis* cisternae. - As these precursors migrate through medial to *trans* cisternae, resident glycosyltransferase enzymes attach carbohydrate oligosaccharides to: 1. Polypeptides via N-linked and O-linked glycosylation, forming Glycoproteins. 2. Sphingolipids and glycerol-lipids, forming Glycolipids. - NCERT explicitly designates the Golgi apparatus as the important site of formation of glycoproteins and glycolipids.
- Endoplasmic reticulum: Site of initial protein synthesis (RER) and steroid/phospholipid synthesis (SER), but the terminal completion of glycoproteins and glycolipids is the hallmark role of the Golgi. - Peroxisomes: Microbodies performing hydrogen peroxide metabolism (catalase) and photorespiration in plants. - Polysomes: Clusters of ribosomes simultaneously translating a single mRNA strand into polypeptides.
Diagnose every choice: Know exactly why the right option works and why distractors fail.
Incorrect. While initial protein/lipid backbones originate in the ER, the definitive formation of glycoproteins and glycolipids occurs in Golgi bodies.
Incorrect. Peroxisomes catabolize fatty acids and decompose H2O2.
Correct. Verbatim NCERT principle: Golgi apparatus is the important site of formation of glycoproteins and glycolipids.
Incorrect. Polysomes synthesize linear polypeptides only; they cannot perform lipid or carbohydrate glycosylation.
Candidates know ER synthesizes proteins and lipids, so they mistakenly choose Endoplasmic Reticulum. NCERT specifically reserves the phrase "important site of formation of glycoproteins and glycolipids" for the Golgi apparatus.
"Golgi apparatus is the important site of formation of glycoproteins and glycolipids."
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