Which organelle is responsible for the addition of carbohydrates to lipids and proteins (glycosylation)?
AGolgi apparatus and rough endoplasmic reticulum
BMitochondria (oxidative phosphorylation site)
CLysosomes (intracellular digestion organelle)
DSmooth endoplasmic reticulum (lipid synthesis site)
Answer & Solution
Correct answer: A. Golgi apparatus and rough endoplasmic reticulum
Glycosylation begins in the rough ER (N-linked glycosylation of nascent polypeptides) and is extended and remodelled in the Golgi (O-linked glycosylation and trimming). Both contribute to mature glycoprotein structure.
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