Phosphatidylethanolamine (neutral)

Phosphatidylserine (negatively charged)

Phosphatidylcholine (neutral)

Sphingomyelin

Lipid and oligosaccharide composition

Monolayer located on the non-cytoplasmic side of the membrane

single transmembrane protein

multiple transmembrane proteins

multi-subunit transmembrane protein

Polypeptide chain is a helix

Two ways to combine

Such as erythroblastin on the surface of red blood cells and cytochrome CZ on the mitochondrial membrane.

The oligosaccharide side chains of membrane glycoproteins or glycolipids are only distributed on the non-cytoplasmic surface (outside); the ATP binding point of the enzyme is on the inside; the hormone receptor is on the outside

How membrane lipid molecules move

Factors affecting membrane lipid fluidity (Ambient temperature, ionic strength, PH, etc. Within a certain limit, as the temperature increases, the fluidity increases)

lateral diffusion

Rotational diffusion (slower)

Internal structure: grid shadow, microtubules fix membrane proteins, microfilaments cause membrane protein movement, cytoskeleton controls membrane proteins