Question Details

In the plasma membrane, Glycolipids are usually situated in

Options

A

cannot be predicted, it varies according to the cell types

B

inner leaflet of plasma membrane

C

outer leaflet of plasma membrane

D

evenly distributed in both outer and inner leaves of plasma membrane

Correct Answer :

outer leaflet of plasma membrane

Solution :

The correct option is outer leaflet of plasma membrane.

Explanation:
The plasma membrane of a eukaryotic cell is an asymmetric lipid bilayer composed of different types of lipids distributed unequally between the two halves (leaflets) of the membrane.

Glycolipids are lipids with a carbohydrate (sugar) chain covalently attached. These molecules play crucial roles in cell-to-cell recognition, communication, and adhesion. Because their primary functions involve interacting with the extracellular environment, signaling molecules, and neighboring cells, their carbohydrate groups must face the outside of the cell.

Consequently, during their synthesis and trafficking through the secretory pathway (specifically inside the lumen of the Golgi apparatus), glycolipids are specifically oriented so that they end up exclusively in the outer leaflet (extracellular leaflet) of the plasma membrane. They are virtually absent from the inner (cytosolic) leaflet.

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