________ to drive carrier protein across membrane.
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Molecules
________ and ions in liquids or a gas move continuously and randomly and so they change direction as they bump into eachother.
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Gas exchange
________ in the alveoli of lungs takes place by diffusion.
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Temprature on diffusion
________: An increase in temperature will increase the rate of diffusion; Molecules gain kinetic energy and so will move faster (faster diffusion)
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Osmosis
________: The net movement of water molecules from a solution of high water potential to a solution of low water potential (down a water potential gradient) across a partially permeable.
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Diffusion
________: the net movement of molecules within a gas or liquid from a region of high concentration to a region of low concentration (down a concentration gradient) across a semi permeable membrane, until equilibrium is reached.
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solution of low water
When it is immersed in a(n) ________ potential: the cell loses water.
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Concentration gradient in diffusion
________: The higher the difference in concentrations the faster the rate of diffusion.
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Active transport
________: the movement of molecules from a region of LOWER concentration to a region of HIGHER concentration (against a concentration gradient)
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plant cell
When a(n) ________ is placed in a solution of low water potential: water leaves the the cell.
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Gas exchange
________ through the stomata of the leaves occurs by diffusion.
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Diffusion
the net movement of molecules within a gas or liquid from a region of high concentration to a region of low concentration (down a concentration gradient) across a semi permeable membrane, until equilibrium is reached
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Concentration gradient
The higher the difference in concentrations the faster the rate of diffusion
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Temprature
An increase in temperature will increase the rate of diffusion; Molecules gain kinetic energy and so will move faster (faster diffusion)
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Surface area of the membrane
Larger surface area of the membrane the higher the rate of diffusion
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Distance over which diffusing molecules travel
Shorter the distances faster the rate of diffusion
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Size of diffusing molecules
Smaller/lighter molecules will move faster and so will have a higher rate of diffusion
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Osmosis
The net movement of water molecules from a solution of high water potential to a solution of low water potential (down a water potential gradient) across a partially permeable
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When a plant cell is placed in a solution of low water potential
water leaves the the cell
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When it is placed in a solution of high water potential
water enters the cell
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When it is immersed in a solution of low water potential
the cell loses water
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When it is immersed in a solution of high water potential
the cell takes in water
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Active transport
the movement of molecules from a region of LOWER concentration to a region of HIGHER concentration (against a concentration gradient)
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Flashcard (30)