act as a barrier between the external environement and the cytoplasm
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what is the role of the membrane at the surface of cells?
regulate transport of materials, contain enzymes, have antigens, release chemicals for singalling, contains receptors
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what is the role of the membrane within cells?
memebranes are present around many organelles, mitochondria have inner cristae, chloroplasts have inner thylakoid
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what is the fluid mosaic model?
proposed by Singer and Nicolson,, model that allowed the passage of molecules through the membrane
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what is the structure of the fluid mosaic model?
phospholipid biylayer, made up of phospholipds with hydrophilic heads and hydrophobic tails, carrier and channel proteins, glycoproteins, glycolipids, cholesterol
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what are phospholipids?
have hydrophilic heads (water loving) that turn towards the water and hydrophobic fatty acid tails (water hating) that face away from the outsides keeping water out
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what are glycolipids?
lipid/phospholipid with a chain of carbohydrate molecules attached
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what are glycoproteins?
protein with a chain of carbohydrate molecules attached
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what are carrier and channel proteins?
proteins that span the whoe lipid bilayer, they are integral proteins; carriers change their shaoe to carry specific molecues across the membrane, channels alow ions with an electrical charge to pass through
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what is cholesterol?
gives mechanical stability and flexibility
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what is the structure of the memerbane of a neurone?
protein channels and plasmas cover the long axon and allow entry and exit of ions to bring the conduciton of electrical impulses, myelin sheath,
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what is the structure of the memerbane in a white blood cell?
contain special protein receptors that enable them to recognise antigens on foreign cells
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Other cards in this set
Card 2
Front
what is the role of the membrane at the surface of cells?
Back
regulate transport of materials, contain enzymes, have antigens, release chemicals for singalling, contains receptors
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