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Diffusion across a membrane in Biology is referred to as 'osmosis' & osmosis is the process by which solvent molecules move from a region of high conc. to low concentration and this can therefore occur only in one direction at a time for a perticular solution.
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When is a substance most likely to diffuse into a cell?
If there is the concentration of substance inside the cell is lesser than outside and cell membrane is permeable to the substance.
Are solutes always able to diffuse through a cell's selective permeable membrane?
No, solutes are not always able to diffuse through a cell's selectively permeable membrane. The ability for solutes to diffuse across a membrane depends on the size, charge, and concentration gradient of the solute. Larger or charged molecules may require the assistance of specialized transport proteins to cross the membrane.
Water molecules diffuse through a selectively permeable membrane?
Water diffuses by facilitated diffusion, passing through water permeable protein channels embedded in the cell membrane. Water molecules can not pass through the lipid bilayer because water is polar. However, polar molecules pass though the cell membrane through the protein channels. The proteins that aid water in passing through the cell membrane are called aquaporins. "Aqua" for water, and "porin" for pore. A "water pore" in essence.
Is water always able to diffuse through a cells selective permeable membrane?
Yes, due to its very small molecular size - unless of course it is frozen.
What substance will diffuse through a membrane?
Substances that are small, nonpolar, and uncharged will diffuse through a membrane easily. This includes gases like oxygen and carbon dioxide, as well as small lipophilic molecules. Larger or charged molecules may require assistance from transport proteins to cross the membrane.
What is the membrane said to be if a substance is able to diffuse across a membrane?
selectively permeable
If a substance is able to diffuse across a membrane then the membrane is said to be what?
selectively permeable
When is a substance most likely to diffuse into a cell?
If there is the concentration of substance inside the cell is lesser than outside and cell membrane is permeable to the substance.
What is the term for a membrane that allows certain but not all molecules to diffuse through it?
semi-permeable.
When there are different amounts of a substance on either side of the cell membrane (a)?
This depends if the particular cell membrane is permeable to the substance or not. If so, then if there was a larger amount of the substance on the outside, it would diffuse into the cell down the concentration gradient. For it to go the other way would require ATP used in active transport.
When there are different amounts of a substance on either side of the cell membrane a what results?
This depends if the particular cell membrane is permeable to the substance or not. If so, then if there was a larger amount of the substance on the outside, it would diffuse into the cell down the concentration gradient. For it to go the other way would require ATP used in active transport.
Are solutes always able to diffuse through a cell's selective permeable membrane?
No, solutes are not always able to diffuse through a cell's selectively permeable membrane. The ability for solutes to diffuse across a membrane depends on the size, charge, and concentration gradient of the solute. Larger or charged molecules may require the assistance of specialized transport proteins to cross the membrane.
If a substance is unable to diffuse across a membrane we say the membrane is?
osmotically active
Which substance did not diffused through the membrane?
starch doesnt diffuse through the dialysis membrane.
Is a membrane selectively permeable?
Selectively permeable means that only certain substances are able pass through the cell membrane.A selectively permeable membrane is a membrane that only can be permeated by selective things, in other words a surface that lets some molecules in but not others. Like a cell membrane will let water diffuse into it :)
Why didn't the corn syrup diffuse into the egg?
Becuase eggshell is a impermabale membrane.
How do cells move through the cell membrane?
Materials move into and out of cells through active transport, diffusion, and osmosis.Active transport occurs when the cell must use energy to actively move the materials up (against) their concentration gradient.Diffusion is passive. This means the cell need not expend energy, the material simply moves from an area of higher concentration to areas of lower concentration. (For example, cook bacon in the kitchen and the smell fills the entire house.)Oxygen and carbon dioxide diffuse across the phospholipid bilayer. Other substances diffuse through proteins embedded in the membrane; this is called facilitated diffusion.Osmosis is the movement of water through a semi-permeable membrane (also called a selectively permeable or differentially permeable membrane), into the solution with the higher solute concentration. This is also a passive process.
