A) self limiting structures.
B) formed spontaneously.
C) stable in aqueous solution.
D) often transformed into vesicles.
E) all are true.

A) they contain both hydrophobic surfaces and hydrophilic surfaces
B) they dissociate from the membrane by treatment with salt solutions
C) they are exposed to at least one aqueous surface surrounding the membrane
D) they are inserted into the membrane and sequestered largely by hydrophobic interactions
E) they have significant lateral mobility

A) when PS is found in the outer monolayer, a floppase enzyme is used to move it to the inner monolayer
B) the movement of phospholipids from one monolayer to another is a very slow reaction despite the fact that it works with the concentration gradient
C) under normal conditions within the cell, the activity of scramblase enzymes is relatively low and thus does not allow for movement between monolayers
D) All of the above are correct
E) B and C above are correct