Cell Membrane

proteins

are distributed irregularly in and out of the membrane

carbohydrates

present only on the outside of the membrane

50% protein 50% lipids and some carbs

composition of the cell membrane

cholesterol

what keeps the cell membrane’s fluidity

polar

means hydrophilic

non polar

means hydrophobic

stiff cholesterol

happens when cell is above Tm

fire cholesterol

happens when cell is below Tm

saturated fats

when this is present, it is hard to pass through the cell HAS NO DOUBLE BOND

unsaturated fats

HAS DOUBLE BOND, molecules can easily pass through the membrane when these are present

lipid rafts

where proteins and lipids gather, rich in cholesterol, sphingomyelin, and glycolipids

endocytosis, platform for cell communication, and receptor function

functions of lipid rafts