The cell membrane is often referred to as asymmetrical or "mosaic". This means that
A) the phospholipids of the membrane can flip- flop such that phospholipids from the inner layer are exchanged with those from the outer layer.
B) only certain substances can pass through the phospholipid bilayer freely, while others require the help of membrane proteins.
C) both layers of the phospholipid bilayer are not identical in terms of protein type or number and phospholipid type.

Question

Quizplus · Accepted Answer

The term "asymmetrical" refers to the fact that the two layers of the phospholipid bilayer are not identical in terms of protein type or number and phospholipid type. The term "mosaic" refers to the presence of various proteins scattered throughout the membrane, which gives it a mosaic-like appearance. Option A is correct, but it is only one aspect of the membrane's asymmetry. Option B is also correct, but it does not address the concept of asymmetry or mosaic nature.

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