Phospholipids are made by integral ER membrane enzymes whose active sites face the cytosol and they are inserted into the outer (cytoplasmic)leaflet of the ER membrane.How then do lipids destined for the luminal leaflet of the ER membrane get there?
A)They diffuse freely into the luminal leaflet.
B)There are enzymes called flippases that flip these lipids later into the opposite leaflet.
C)They are disassembled on the cytoplasmic side and reassembled on the luminal side.
D)They move to the cytoplasmic leaflet by osmosis.
E)There are enzymes called translocases that flip these lipids later into the opposite leaflet.

Question

Quizplus · Accepted Answer

Flippases are enzymes that facilitate the movement of phospholipids from one leaflet of a membrane bilayer to the other, ensuring proper distribution between the two leaflets.

Phospholipids Are Made by Integral ER Membrane Enzymes Whose Active