Cell membranes

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What charge do phospholipids have?
POLAR
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What properties do phospholipids have?
hydrophillic head and hydrophobic tail
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What implications does this cause the membrane?
Two different responses to water
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What happens when a phospholipid is suspended in water?
They form bilayers with hydrophobic tails inside and hydrophillic heads outside
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What is the size of a monofilm layer of phospholipids when compared to the surface area of a cell?
The film was twice as large as the cell surface area
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Where are carbohydrates found on the model?
On the outside
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What molecules does diffusion let through?
Small or non polar lipid soluble molecules
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for example?
Oxygen or carbon dioxide
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How do the molecules move through the membrane?
Directly through the phospholipid bilayer
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What form of movement is this?
Passive
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What is the movement of the water like?
net movement down concentration gradient
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What is needed for facilitated diffusion?
Channel protein
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What is osmosis diffusion of?
free water molecules
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What kind of movement is it?
Net movement
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from what kind of solution?
A solution with a lower solute concentration
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Through what kind of membrane?
Partially permeable membrane
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Where does active transport occur?
In the carrier protein
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What is needed for active transport?
Break down of ATP
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Where does it occur?
Up a concentration gradient
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What is bulk transport?
Vesicles made from cell surface membrane in endocytosis and fusing with the cell membrane in exocytosis
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What is step one in the investigating membrane experiment?
Cut equal sized pieces of tissue
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What do you do with these tissue samples?
Rinse under running water to remove all betalin released by cutting
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Where are the pieces of beetroot placed?
In equal volumes of distilled water,
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What do you have to keep the same when using different temps of water?
Leave for equal time or the same volume of water
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What do you measure?
The abundance of the betalin solution
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What are three ways gas exchange surfaces adapt to gas exhange?
The larger the area, thinner the diffusion path, steeper the concentration gradient
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How is the lung adapted to surface area?
Many alveoli give huge surface area
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How is the lung adapted to concentration gradient?
well supplied, constantly circulating blood which carries oxygen away and CO2 to the surface, breathing keeps CO2 levels down and O2 levels high
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How are the lungs adapted to thickness of gas exhange surface?
they are very thin just one epithelial cell in thickness
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What does this do?
Reduce the distance for diffusion
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Other cards in this set

Card 2

Front

What properties do phospholipids have?

Back

hydrophillic head and hydrophobic tail

Card 3

Front

What implications does this cause the membrane?

Back

Preview of the front of card 3

Card 4

Front

What happens when a phospholipid is suspended in water?

Back

Preview of the front of card 4

Card 5

Front

What is the size of a monofilm layer of phospholipids when compared to the surface area of a cell?

Back

Preview of the front of card 5
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