The Cell Membrane Is Often Referred to as Asymmetrical or "Mosaic".This

question 21

Multiple Choice

The cell membrane is often referred to as asymmetrical or "mosaic".This means that

• A)both layers of the phospholipid bilayer are not identical in terms of protein type or number and phospholipid type.
• B)only certain substances can pass through the phospholipid bilayer freely,while others require the help of membrane proteins.
• C)the phospholipids of the membrane can flip-flop such that phospholipids from the inner layer are exchanged with those from the outer layer.