Biology flashcards

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  • Created by: maisiet
  • Created on: 10-10-13 09:32
What is osmosis?
The net movement of water molecules from a region of higher water potential to a region of lower water potential across a partially permeable membrane.
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What is water potential?
A measure of the ability of water molecules to move freely in solution.
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What does isotonic mean?
Isotonic is relating to a solution having the same osmotic pressure as some other solution, e.g one in a cell or a body fluid.
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What is the word for a plant cell that has no water?
Plasmolysed
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What is the word for a animal cell that has no water?
Crenated- shrivelled
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What is the word for a plant cell that has lots of water?
Turgid
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What is the word for a animal cell that has lots of water?
Haemolysed
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Does pure water have a high or low water potential?
High water potential- high number of water molecules
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What is diffusion?
The net movement of molecules or ions in a gas or liquid from an area of high concentration to an area where they are less concentrated.
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What is a diffusion gradient?
The gradient in molecular concentration (the difference in concentrations) that allow diffusion to occur.
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What do both osmosis and diffusion have in common?
They are both passive processes they don't need energy. They are both a net movement and both aim to reach equilibrium.
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What are the differences between osmosis and diffusion?
osmosis is water molecules, diffusion is gas and other liquids like oil/petrol. Diffusion doesn't have a partially permeable membrane.
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What are the 6 ways you can speed up diffusion?
Concentration gradient, size of molecule, thickness of cell membrane, blood moving/stirring, temperature and surface area.
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Other cards in this set

Card 2

Front

What is water potential?

Back

A measure of the ability of water molecules to move freely in solution.

Card 3

Front

What does isotonic mean?

Back

Preview of the front of card 3

Card 4

Front

What is the word for a plant cell that has no water?

Back

Preview of the front of card 4

Card 5

Front

What is the word for a animal cell that has no water?

Back

Preview of the front of card 5
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