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Diffusion and Osmosis are passive transport mechanisms meaning they do not require?
Wiki User
∙ 14y ago
They do not require energy, which is often in the form of ATP.
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∙ 14y ago
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Is xylem an osmosis?
xylem is transport tissue made up of dead cells within vascular plants whose primary responsibility is to transport water to all the parts of the plants. osmosis is the diffusion of water across a semi-permeable membrane down the water potential gradient, meaning the water moves to from an area that has a high concentration of water to an area that has a low concentration of water.
What is the movement of molecules from areas of higher concentration to lower concentration until equilibrium is met?
The movement of particles from an area of high concentration through a semi-permeable membrane to an area of low concentraton is the process of diffusion. I'm sorry but I do not think that answer is good enough. It is a form of diffusion, where only small particles, small enough to pass through the membrane can get through. When I was in school the statement above was the definition of osmosis, the whole point being it was diffusion through a semi-permeable membrane, selecting for only small enough particles. It seems some time between 1992 and 2003 the definition was changed to the movement of water, and not particles and now in 2010 the definition is the movement of solvents. I would like to know how and why the definition osmosis was changed, why and what is the justification? I would also like to know why the original meaning of osmosis, which made perfect sense, has been changed to "it's the definition of diffusion and not osmosis any more", when in fact it isn't a clear enough word to describe the process? Surely the new definition of osmosis is also diffusion?
What is it called when water diffuses across a cell membrane?
Passive molecular diffusion. The Cell can't be compared to a hollowed out potato! Meaning that the osmotic flow of water into the sugar filled potato interior pool is unidirectional; while the Cell may control the flow of water, in or out, depending upon it's needs.
Does Osmosis use ATP?
No. Osmosis is passive, meaning it does not require ATP.
Why is facilitated diffusion faster than simple diffusion?
Facillatated diffusion is faster than simple diffusion when solute concentration is low because it uses channels to transport molecules throught the lipid bilayer. Simple diffusion depends upon concentration gradients so the net movement of diffusing molecules depends on the concentration gradient, thus the rate of diffusion is directly proportional to the concentration gradient. Simple diffusion is also a type of passive transport, which requires no energy input, whereas facilitated diffusion is protein mediated transport. Passive diffusion of solute into a cell is linearly related to the concentration of solute outside the cell. Carrier proteins increase the rate of diffusion by allowing more solute to enter the cell. Facilitated diffusion, however, approaches a maximum rate as the carrier proteins become saturated with solute.
Diffusion and osmosis prefix meaning inside?
endo means inside.
What is the random movement of molecules and ions down their concentration gradient called?
The random movement of molecules and ions down their concentration gradient (meaning from an area of high concentration to an area of low concentration) is called simple diffusion. Simple diffusion is related to the magnitude of driving force, permeability of the membrane, and surface area.
What are the similarities between diffusion and facilitated diffusion?
Diffusion is the main method by wich small molecules move across the cell membrane. while many cellular processes depend on osmosis because cells cannot function properly without adequate water. Facilitated diffusion works through channels and Osmosis only works with water.
Is xylem an osmosis?
xylem is transport tissue made up of dead cells within vascular plants whose primary responsibility is to transport water to all the parts of the plants. osmosis is the diffusion of water across a semi-permeable membrane down the water potential gradient, meaning the water moves to from an area that has a high concentration of water to an area that has a low concentration of water.
How is omosis defined?
Osmosis is the diffusion of fluid through a semipermeable membrane.
How the terms in each pair differ in meaning of osmosis and diffusion?
Osmosis is the diffusion of water through a selectively permeable membrane. Diffusion refers to the simple property of moving from an area of high concentration to an area of low concentration so that the concentration of the total area will be equal and balanced (at equilibrium). Diffusion can occur with any substance and does not require but can involve a permeable membrane.
What is the movement of molecules from areas of higher concentration to lower concentration until equilibrium is met?
The movement of particles from an area of high concentration through a semi-permeable membrane to an area of low concentraton is the process of diffusion. I'm sorry but I do not think that answer is good enough. It is a form of diffusion, where only small particles, small enough to pass through the membrane can get through. When I was in school the statement above was the definition of osmosis, the whole point being it was diffusion through a semi-permeable membrane, selecting for only small enough particles. It seems some time between 1992 and 2003 the definition was changed to the movement of water, and not particles and now in 2010 the definition is the movement of solvents. I would like to know how and why the definition osmosis was changed, why and what is the justification? I would also like to know why the original meaning of osmosis, which made perfect sense, has been changed to "it's the definition of diffusion and not osmosis any more", when in fact it isn't a clear enough word to describe the process? Surely the new definition of osmosis is also diffusion?
What is it called when water diffuses across a cell membrane?
Passive molecular diffusion. The Cell can't be compared to a hollowed out potato! Meaning that the osmotic flow of water into the sugar filled potato interior pool is unidirectional; while the Cell may control the flow of water, in or out, depending upon it's needs.
Does Osmosis use ATP?
No. Osmosis is passive, meaning it does not require ATP.
What is the same between osmosis and diffusion?
It's easier to understand the similarities between osmosis and diffusion if we look at their differences. Basically, diffusion is the random motion of particles along the concentration gradient (simply particles moving from high to low concentration) Whereas osmosis is specifically the motion of water molecules across a selectively permeable membrane (think cell membrane) from an area of high water concentration (or potential) to an area of low water concentration (or potential) So what's the same? they both: follow the gradient (high to low concentration) meaning they do not require energy to occur will continue until concentrations are equal on both sides there are more similarities, but it might be easier just remembering that osmosis is just selective diffusion (esp for solvent molecules, most often water)
Why is facilitated diffusion faster than simple diffusion?
Facillatated diffusion is faster than simple diffusion when solute concentration is low because it uses channels to transport molecules throught the lipid bilayer. Simple diffusion depends upon concentration gradients so the net movement of diffusing molecules depends on the concentration gradient, thus the rate of diffusion is directly proportional to the concentration gradient. Simple diffusion is also a type of passive transport, which requires no energy input, whereas facilitated diffusion is protein mediated transport. Passive diffusion of solute into a cell is linearly related to the concentration of solute outside the cell. Carrier proteins increase the rate of diffusion by allowing more solute to enter the cell. Facilitated diffusion, however, approaches a maximum rate as the carrier proteins become saturated with solute.
Is carrier proteins passive transport or active transport?
Carrier proteins can use active or passive transport depending on what type of carrier protein it is (meaning what the protein transports). The form of passive transport that they use is facilitated diffusion. An example of active transport is the Sodium Potassium pump. Active transport requires ATP. Facilitated diffusion is used to transport polar molecules and ions that cannot directly cross the cell membrane. Facilitated diffusion doesn't require energy.
