Question

enzymes that move certain phospholipids between leaflets have also which of the following properties?

A. play a role establishing and maintaining membrane lipid asymmetry

B. Transport proteins

C.Blocks post-synaptic membrane

D.Interacts with neighboring epithelial cells, or basal membrane

E. All of these are correct.

Answer 1

Answer:

A. play a role establishing and maintaining membrane lipid asymmetry

Explanation:

Proteins that move move certain phospholipids between leaflets are transmembrane proteins via "flip-flop" transition have also the possibility to maintain membrane lipid asymmetry. There are few types of such proteins:

• flipases-move lipids from the exterior to the interior side of the membrane, energy required

• flopases-move lipids in reverse comparing to flipases, energy required

• scramblases-no energy required, bidirectional

Because of the action of those proteins, cytosolic side of plasma membrane differs from exoplasmic side (asymmetry).