Practice question
Question
Glycosylation of membrane proteins and lipids is carried out by enzymes present in the lumen of endoplasmic reticulum and Golgi. The glycosylated part of membrane proteins and lipids in the plasma membrane is likely to be:
Explanation
The principle of enzyme catalysis and lipid structure explains that substrate affinity, transition state stabilization and phospholipid composition govern function. Hence Exposed to the extracellular environment fits best because it reflects catalytic efficiency and membrane organization, as documented in authoritative sources on biochemistry.
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