Cell-Surface Membrane

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What is the function of cholesterol?
Prevent water/dissolved ion loss
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How does cholesterol do its job?
By being hydrophobic, forcing water and dissolved ions to be repelled away from the membrane
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How does cholesterol control the flexibility of the membrane?
By adding strength to the membrane and pulling the fatty acids together; especially at higher temperatures
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Which part of glycolipids extend out of the membrane and where to?
The carbohydrate section; into the watery environment
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What are the functions of glycolipids in membranes?
Act as recognition sites for materials; help cells stick together
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What are the functions of glycoproteins?
Act as recognition sites for materials, hormones, neurotransmitters and lymphocytes;
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What is the carbohydrate section attached to?
Extrinsic proteins
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Why is the membrane not permeable to everything?
Molecules are too large; molecules have a different charge to the channel proteins; materials are not soluble in lipids
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What is the rate of movement affected by?
Surface area; number of carrier/channel proteins; differences in water potential
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Why is it good that phospholipids make up the membranes?
They allow for flexible and a self-sealing membrane
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Besides from working in diffusion, what are proteins good for?
Providing strength; helping the cells stick together; structural support
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Other cards in this set

Card 2

Front

How does cholesterol do its job?

Back

By being hydrophobic, forcing water and dissolved ions to be repelled away from the membrane

Card 3

Front

How does cholesterol control the flexibility of the membrane?

Back

Preview of the front of card 3

Card 4

Front

Which part of glycolipids extend out of the membrane and where to?

Back

Preview of the front of card 4

Card 5

Front

What are the functions of glycolipids in membranes?

Back

Preview of the front of card 5
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