When and where is the asymmetry of the phospholipid bilayers initially established?
A)in the Golgi complex during lipid and protein modification
B)in the ER during lipid and protein synthesis
C)in the secretory vesicles during lipid and protein modification
D)in the mitochondria by random insertion into the membranes
E)all of these are correct

Question

Quizplus · Accepted Answer

The asymmetry of the phospholipid bilayers is established in the endoplasmic reticulum (ER) during lipid and protein synthesis. As new phospholipids are made by the ER, they are inserted into the outer leaflet of the developing membrane. The asymmetry is maintained by lipid transporters that move specific phospholipids from one leaflet to the other.

When and Where Is the Asymmetry of the Phospholipid Bilayers