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List components of cell membrane
Cholesterol
Hydrophobic tail and hydrophylic head
Phospholipids bilayer
Internal and external proteins
Channel proteins and carrier
Glycoprotein
What is the function of cholesterol in cell membrane
Gives the membrane stability. Cholesterol binds to hydrophobic tails of phospholipids which packs them closer together so restricting movement of phospholipids making cells less fluidhhg
What is active transport
The movement of molecules or charged ions from a low concentration to a high concentration this process requires energy from ATP
What is osmosis
The movement of water molecules from a high water potential to a low water potential across a partially permeable membrane
What happens to membrane at temperature below 0
As there are channel proteins within the membrane, these will denature which makes membrane more permeable
What happens to membrane between 0-45 degrees
Phospholipids move around more as they have more energy which increases permeability of membrane
What happens to the membrae above 45 degrees celsius
Phospholipids bilayer breaks down so more permeability. Water inside cell expands so puts more pressure on membrane. Channel proteins denature s
What is diffusion
Net movement of particles from high concentration to low concentration
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