Summary: Plasma Membrane
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1 Plasma membrane
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Plasma membrane mosaic composition
40% lipid
50% protein
10% carbohydrates -
Fluidity is due to lateral movement of the __ with protein drifting among them
Phospholipids -
Lipids; the hydrophilic section
toward water areas -
Keep membrane fluid at low temperatures
Cholesterol -
Prevents too much fluidity at high temperatures
Cholesterol -
Anchors the cytoskeleton, flagella, cilia, and extracellular matrix
Peripheral membrane proteins -
Carrier proteins bind specific molecules and transport across using a scissor action
I; Transmembrane proteins -
Partially embedded integral proteins help
Cells recognize proteins
Binding (receptors help initiate reactions -
An equal distribution molecules on both sides of a membrane
Equilibrium -
Depends on the concentration of dissolved substances in the cytoplasm (animal cells) and central vacuole (plant cells)
Control of osmotic pressure
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