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How is facilitated diffusion similar to diffusion ion channels?
Wiki User
∙ 16y ago
They are both types of passsive transportation.
Wiki User
∙ 16y ago
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Why do you think movement of ions through ion channels is generally a slower process that diffusion?
Let's take something obvious. Where would a crowd of persons move faster? Where there is absolutely nothing to prevent their passage or where there is an open gate? The same thing applies to the movement of ions. Movement of ions through ion channels is a slower process because (with a more scientific approach!) their movement is determined by the number of these ion channels whereas for diffusion, there is absolutely nothing to prevent the passage of the molecules.
Does facilitated diffusion require ATP?
In cells, passive diffusion is energy independent and therefore does not require ATP. This is opposed to active transport which requires either energy in the form of ATP or a charge gradient to move a molecule or ion across the membrane.
Ions can move through water by what process?
It depends whether by "channels" you mean channel proteins or ion pumps.Substances that move through channel proteins do so by facilitated diffusion. This is diffusion, and therefore is passive (it requires no energy input from the cell). It is called facilitated, because the substances cannot pass through the phospholipid bilayer, and so their passage across the membrane is facilitated by the channels.Ion pumps are different. They move ("pump") a substance against its concentration gradient. This does require a supply of energy, and the cell may supply this by breaking down ATP. The process is called active transport, and can only occur in carrier proteins. Ion pumps are one form of carrier protein.
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.
Which cell transport process requires cell energy?
Simply because these substances are going against the gradient of concentration; from low concentration to high concenration. For example: in order to get to the top of the mountain (high concentration) you need to spend energy (ATP`s) climbing from the bottom (low concentration).
Is diffusion through ion channels a form of active transport?
Facilitated diffusion, or diffusion through ion channels, is not a form of active transport. It is a spontaneous passive transport.
Is facilitated diffusion ion channels an active or passive transport?
passive
A type of transport in which water moves across a membrane and down its concentration gradient is?
"Active Transport" is the answer given but if it is the passive movement then no energy is required so isn't it facilitated diffusion?
In the membrane of a cell channels serve as what?
In the membrane of a cell, channels serve as passageways.
What substance crosses the cell membrane by facilitated diffusion?
a sodium ion
What transport protein allows ions to pass through the cell membrane?
Ion Channels allows ions to pass through the cell membrane.
What is an example of diffusion through ion channels?
Well, the materials pass through go in one end, and the ion channels open and let them pass through, but only with solutes
What happen during the facilitated diffusion?
Facilitated diffusion occurs against the osmotic potential/concentration gradient and requires energy at the expense of the ATP hydrolysis. There are several way in which this diffusion could occur in the cells. The first one being the ion exchangers. The ion exchangers are coupled with ATPase activity and they exchange ion(s) across the membrane. The most classical example of ion exchanger is the Na+/K+ ion exchanger and Ca+ ATPase. Other way of the facilitated diffusion in the ion channel. These could be voltage gated channel that open in response to the change in the membrane potential and the other being ligand gated channel that operate under the effect of ligand binding.
How does facilitated transport differ from active transport?
Simple diffusion = flow of small molecules ALONG the concentration gradient, does NOT require energy. facilitated diffusion = flow of molecules ALONG the concentration gradient with help of CARRIER PROTIENS or CHANNELS, does NOT require energy active transport= flow of larger or charged molecules AGAINST their concentration gradient, REQUIRES input of ENERGY in the form of ATP.)
Facilitated transport means?
Facilitated diffusion Facilitated diffusion in cell membrane, showing ion channels and carrier proteins Facilitated diffusion (or facilitated transport) is a process of diffusion, a form of passive transport facilitated by transport proteins. The facilitated diffusion may occur either across biological membranes or through aqueous compartments of an organism. Polar molecules and charged ions are dissolved in water but they can not diffuse freely across cell membranes due to the hydrophobic nature of the lipids that make up the lipid bilayers. Only small nonpolar molecules, such as oxygen can diffuse easily across the membrane. All polar molecules should be transported across membranes by proteins that form transmembrane channels. These channels are gated so they can open and close, thus regulating the flow of ions or small polar molecules. Larger molecules are transported by transmembrane carrier proteins, such as permeases that change their conformation as the molecules are carried through, for example glucose or amino acids. Non-polar molecules, such as retinol or fatty acids are poorly soluble in water. They are transported through aqueous compartments of cells or through extracellular space by water-soluble carriers as retinol binding protein. The metabolites are not changed because no energy is required for facilitated diffusion. Only permease changes its shape in order to transport the metabolites. The form of transport through cell membrane which modifies its metabolites is the group translocation transportation.
Which of the following required the most ATP to move the molecule across a plasma membrane?
Ion moving against a concentration gradient
Does facilitated diffusion require ATP?
In cells, passive diffusion is energy independent and therefore does not require ATP. This is opposed to active transport which requires either energy in the form of ATP or a charge gradient to move a molecule or ion across the membrane.
