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Does osmosis or facilitated diffusion require the presence of membrane channels?
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∙ 12y ago
facilitated diffusion
Wiki User
∙ 12y ago
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If diffusion is going to occur there has to be what?
A difference in the concentration throughout space because diffusion doesn't just happen in a cell or aqueous solution by definition diffusion is just from high to low concentration
What is the advantage of the presence of on cell membranes?
the membrane has a greater surface area for an increased rate of diffusion
What two requirements distinguish osmosis from diffusion?
Diffusion and osmosis are both types of passive transport. The two requirements that distinguish osmosis from diffusion are the presence of a membrane and the type of substance.
The reason that water soluble molecules cannot enter certain regions of the plasma membrane is due to the presence of?
gated channels which close when ions are present
When It Comes To Facilitated Diffusion What Is The Difference Between Ion Channels?
Solutes are not necessarily ions. Solute transporters and ion channels involve the moving of ions across a cellular membrane. Both a transporter and a channel have the same purpose, but different functions. Ion channels are proteins that open a pore often in the presence of a ligand, or a binding partner, that allows for a free flow of ions through its gap. A transporter is defined much the same, but involves an occluded state, or a state in which the ion is trapped within the protein, and must wait for either side of the protein to open before it can escape. Technically, the difference between a transporter and an ion channel is very ambiguous as both seem to use very similar pathways. However, for clarity sake, channels are proteins which open a clear tunnel for passage. While transporters utilize stepwise changes in protein conformation which trap the ion and then allow it to move down to the other side of the membrane.
What is the difference between simple diffusion and facilitated diffusion?
It doesn't. (answer by RRU member Cyrem)
What process the cell must use to allow the protein to enter and why?
The process the cell must use to allow the protein to enter is rather simple and uncomplicated. The cell uses the process of osmosis and diffusion along a concentration gradient to allow for passage in and out of the cell.
If diffusion is going to occur there has to be what?
A difference in the concentration throughout space because diffusion doesn't just happen in a cell or aqueous solution by definition diffusion is just from high to low concentration
What is the advantage of the presence of on cell membranes?
the membrane has a greater surface area for an increased rate of diffusion
What two requirements distinguish osmosis from diffusion?
Diffusion and osmosis are both types of passive transport. The two requirements that distinguish osmosis from diffusion are the presence of a membrane and the type of substance.
The reason that water soluble molecules cannot enter certain regions of the plasma membrane is due to the presence of?
gated channels which close when ions are present
When It Comes To Facilitated Diffusion What Is The Difference Between Ion Channels?
Solutes are not necessarily ions. Solute transporters and ion channels involve the moving of ions across a cellular membrane. Both a transporter and a channel have the same purpose, but different functions. Ion channels are proteins that open a pore often in the presence of a ligand, or a binding partner, that allows for a free flow of ions through its gap. A transporter is defined much the same, but involves an occluded state, or a state in which the ion is trapped within the protein, and must wait for either side of the protein to open before it can escape. Technically, the difference between a transporter and an ion channel is very ambiguous as both seem to use very similar pathways. However, for clarity sake, channels are proteins which open a clear tunnel for passage. While transporters utilize stepwise changes in protein conformation which trap the ion and then allow it to move down to the other side of the membrane.
What substances move into and out of cells by diffusion?
diffusion- substances move across the cell membrane from areas of high concentration to areas of low concentration osmosis is the diffusion of water across a cell membrane (area of high concentration to an area of low concentration)
How do other molecules pass through the selectively permeable cell membrane?
[Molecules pass through the cell membrane] through a process known as osmosis. ------------------------------------------------------- Yes, osmosis is a great part of diffusion of molecules, but another important factor to consider is the presence of protein channels in the membrane. The cell membrane is actually a lipid bilayer, in which proteins are embedded. Normally, molecules will simply be diffused through these chanells, but in some cases, the protein must be modified in order to allow the molecules to flow. This is called active transport, which requires energy in order to change the shape of the protein and allow the foreign molecule to pass.
What is the explanation for the process of capillary exchange?
Capillary exchange is the process by which substances, such as oxygen and nutrients, are exchanged between the blood in capillaries and the surrounding tissues. This occurs through diffusion, facilitated diffusion, and active transport. The exchange is driven by a concentration gradient and the movement of substances across the capillary wall is regulated by small pores called fenestrations and by the presence of transport proteins.
Effect of the presence of other molecules on the diffusion of a given substance?
It explodes
How can a mucous membrane be identified?
By presence of mucus , presence of a layer in a tubular organ leading toward out side via an opening .
