Single phospholipids, double phospholipids and proteins.
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What does it mean when the cell membrane is selectively permeable?
Only some things can pass through depending on their size.
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What is a concentration gradient?
The difference between 2 areas.
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What does the term 'passive' transport mean?
It doesn't require energy.
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What does diffusion mean?
Diffusion is the movement of molecules from a high concentration to a low concentration down a concentration gradient. It is passive so it doesn't require energy.
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Why is diffusion important to single celled organisms such as amoeba?
Single cell organisms rely on diffusion to bring useful substances in and waste products out of the cell.
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What does osmosis mean?
Osmosis is the net movement of water from a high water concentration to a low water concentration through a selectively permeable membrane. It is a passive process so it doesn't require energy.
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Why does a red blood cell burst when placed in water?
Does Not have a cell wall.
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Why does the red blood cell shrink when placed in strong sucrose solution?
The water moves out. The loss of water causes the cell to shrink.
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What does turgid mean?
Water moves in but cell wall prevents bursting.
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What does plasmolysed mean?
Water moves out.
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Why does a plant cell not burst when placed into water?
The water moves into the cell from a high water concentration to a low water concentration. As cells have a strong cell wall.
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What name is given to the condition of plant cells when placed in pure water?
Turgid.
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What name is given to the condition of plant cells when placed in strong sucrose solution?
Plasmolysed.
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What does active transport mean?
Active transport is the movement of charged particles or molecules across the membrane from a low concentration to a high concentration against a concentration gradient.
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How is active transport different than osmosis or diffusion?
The direction is different so its low to high and it does require energy.
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What role does carrier proteins play in active transport?
Ions move against the concentration gradient and require the help of some proteins in the plasma membrane. These proteins are called 'carrier proteins'.
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Other cards in this set
Card 2
Front
What does it mean when the cell membrane is selectively permeable?
Back
Only some things can pass through depending on their size.
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