Is a planer sandwich of 2 layers of lipid An hydrophilic head and an hydrophobic tail

Bilayer of lipid molecules, integral proteins, peripheral proteins

Glycocalyx

Glycoprotein

Glycolipid

Serving as signaling platforms involved in cell signaling and membrane trafficking

phosphatidic acid (PA) phosphatidylglycerol (PG) phosphatidylethanolamine(PE) phosphatidylcholine (PC) phosphatidylserine (PS) phosphatidylinositol (PI)

Phosphoglyceride, Sphingolipid, Sterol, Glycolipid

1. A three carbon backbone of glycerol 2. 2 long chain fatty acids esterified to c1 and c2 3. Phosphoric acid esterified to c3

C1 has no to 1 double bonds, C2 has 2 or more double bonds

• Double bond between c4 and c5 • C1 and c2 are the variation part for different sphingolipid • Fatty acid in c2 and polar head in c1

Cholesterol's apolar four-ring structure inserts in the bilayer core with the C3 hydroxyl facing outward.

Head group

14-20

Are lipids with carb group

Cell recognition, cell signaling, membrane stability

Structure is entropy favorable, surface of bilayers is very rough, fatty acid chain undergo internal motions on a picosecond

Membrane

Flexible

They move at 1um/s in the plane

They flip

Internal, peripheral, carbs

Integral is inside the bilayer but the peripheral is on the surface of the membrane

A-helices and B-strands with a-helices being most common

Less than 10%