Glycoproteins play a key role in cell recognition and signaling by serving as identification markers on the cell surface.

Membrane transport proteins assist in the movement of substances across the cell membrane, either passively or actively.

The phospholipid bilayer provides selective permeability, allowing certain substances to pass while blocking others.

Cholesterol helps to stabilize the fluidity of the membrane, preventing it from becoming too rigid or too fluid.

Membrane proteins facilitate transport across the membrane and are involved in signaling pathways.

Cholesterol molecules intercalate between phospholipids, maintaining membrane fluidity across varying temperatures.

The fluid mosaic model describes the cell membrane as a dynamic and flexible structure with various proteins floating in or on the fluid lipid bilayer.

Small nonpolar molecules can easily diffuse through the lipid bilayer due to their compatibility with the hydrophobic core.

Active transport requires energy, usually in the form of ATP, to move substances against their concentration gradient.