The Fluid Mosaic Model

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  • Created by: Steff06
  • Created on: 04-04-16 12:06
What is a glycoprotein?
Where protein molecules have a carbohydrate part attached to them.
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What is a glycolipid?
Where phospholipid molecules have a carbohydrate part attached they are called glycolipids.
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What is the role of cholesterol?
To give stability to membranes of eukaryotic cells.
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How does cholesterol provide this stability?
Cholesterol sits between the fatty acid tails and makes the barrier more complete which prevents substances e.g. water and ions from passing through the membrane easily/directly.
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How do some substances get across the membrane?
Using channel or carrier proteins.
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What do channel proteins do?
Allow movement of substances across the membrane. Some molecules are too large/hydrophilic to pass directly through the bilayer, so use channel proteins.
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What do carrier proteins do?
Carrier proteins actively move substances across the membrane. E.g. Mg+ ions are actively pumped using ATP energy into root hair cells.
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Describe receptor sites
Hormones bind to a cell so a response can e carried out. Can only bind with a receptor.
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What are glycoproteins and glycolipids also involved in and what do they act as?
Involved in cell signalling and act as a hormone receptor.
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Describe metabolic processes and the Fluid Mosaic Model
Enzymes and coenzymes. Some reactions in photosynthesis and respiration happen in membranes. Enzymes and coenzymes may be bound to these membranes.
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What effect does increasing temperature have on the membrane?
Increasing temperature increases kinetic energy which increases movement which makes the membranes leaky.
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What happens once the membrane becomes leaky?
Substance that would not normally do so enter or leave the cell.
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Other cards in this set

Card 2

Front

What is a glycolipid?

Back

Where phospholipid molecules have a carbohydrate part attached they are called glycolipids.

Card 3

Front

What is the role of cholesterol?

Back

Preview of the front of card 3

Card 4

Front

How does cholesterol provide this stability?

Back

Preview of the front of card 4

Card 5

Front

How do some substances get across the membrane?

Back

Preview of the front of card 5
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