movement molecules area greater concentration lesser concentration What is osmosis

What is the movement of molecules from an area of greater concentration to an area of lesser concentration?

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National 5

Transport across membranes

All cells are enclosed by a cell membrane, which is selectively permeable. Molecules can move into or out of cells by diffusion and active transport. Cells can gain or lose water by osmosis.

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Biology

Cell biology

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Diffusion

Molecules can move into or out of cells by the process of diffusion.

The video below shows how you can investigate diffusion and selective permeability using a model cell.

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Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. This is due to the random movement of the molecules.

The difference in the concentration of a substance between two areas is called the concentration gradient. The bigger the difference, the steeper the concentration gradient and the faster the molecules of a substance will diffuse.

The direction of diffusion is said to be 'down' or 'with' the concentration gradient.

Diffusion stops when the concentration of the substance is equal in both areas. This does not mean that the molecules of substance are not moving any more, just that there is no overall movement in one direction. Molecules of substance are moving equally in both directions.

Diffusion can be observed by placing potassium permanganate into a beaker of water.

The crystals begin to diffuse into the water to give layers of different concentrations.

After one hour, equilibrium has been reached which means the potassium permanganate crystals are at an equal concentration throughout the water. Diffusion has stopped.

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What is the term for the movement of molecules from an area of greater concentration to an area of lesser concentration hint no energy required?

Diffusion is the movement of particles from areas of higher concentration to areas of lower concentration. It is a natural, random process. This means that it does not require extra energy input.

What is the movement of particles from an area of higher concentration to an area of lower concentration multiple choice question?

Diffusion. Diffusion is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space.

What is the term for the movement of molecules from an area of greater concentration to an area of lesser concentration with the assistance of a carrier protein?

Facilitated diffusion is the transport of substances across a biological membrane from an area of higher concentration to an area of lower concentration with the help of a transport molecule.

What is movement of molecules from an area of higher concentration to an area of lower concentration?

Diffusion is the movement of molecules from an area of high concentration of the molecules to an area with a lower concentration. For cell transport, diffusion is the movement of small molecules across the cell membrane.

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