Answer:
The tertiary and quarternary gene expression product that is found exclusively in the extracellular leaflet of a cell is the glycolipids.
Step-by-step explanation:
The glycolipids are found exclusively in the outer leaflet of the plasma membrane, with their carbohydrate portions exposed on the cell surface. They are relatively minor membrane components, constituting only about 2% of the lipids of most plasma membranes.
The outer leaflet consists predominantly of phosphatidylcholine, sphingomyelin, and glycolipids.