How Was the Asymmetry of Membrane Lipids Discovered

Multiple Choice

How was the asymmetry of membrane lipids discovered?

A) The lipid asymmetry was visualized in the electron microscope.
B) The lipid asymmetry was observed with a special stain in the light microscope.
C) Treatment of intact red blood cells with phospholipases.
D) Treatment of intact red blood cells with trypsin.
E) Treatment of liver cells with phospholipases.