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Top competitors on query "where does facilitated diffusion occur in the cell membrane"
Movement of molecules across cell membranes - Biology Online
http://www.biology-online.org/9/3_movement_molecules.htm Competition: low
Solute flux magnitude through a mediated transport system is positively correlated with the number of transporters, the rate of conformational change in the transporter protein, and the overall saturation of transporter binding sites which is dependent on the solute concentration and affinity of the transporter. There will be a net diffusion of both compartments leading to diffusion equilibrium with no change in volume in either compartment if the compartments are separated by a membrane that is permeable to both a solute and water
http://library.thinkquest.org/27819/ch3_2.shtml Competition: low
One form of passive transport utilizes protein channels, whereby protein molecules in the membrane form a tunnel through which polar molecules may diffuse without ever coming in contact with the fatty acids. In this process, proteins called carrier proteins bond with the molecule on one side of the membrane, move through the membrane, and then release it on the other side
http://www.angelfire.com/sc/mrcomeau/transportnotes.html Competition: low
Net movement of water is from a hypotonic solution (low solute concentration or high water concentration) to hypertonic solution (higher solute concentration or lower water concentration). hypotonic solution - lower solute concentration or higher water concentration outside of cell hypertonic solution- higher solute concentration or lower water concentration outside of cell isotonic - solute concentration or water concentration outside of cell same as inside of cell hypotonic solution - there is a net movement of water into the cell (may cause lysis) hypertonic solution - there is no net movement of water out of the cell isotonic - there is no net movement of water across the membrane hypotonic solution - may cause lysis in animals, turgor pressure develops in plants hypertonic solution - causes crenation in animals, causes plasmolysis in plants See the diagram below to better understand the effects of different solutions Collect, display, and interpret data Complete potato disc assignment
Semipermeable membrane - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Semipermeable_membrane Competition: low
The rate of passage depends on the pressure, concentration, and temperature of the molecules or solutes on either side, as well as the permeability of the membrane to each solute. A semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion"
Passive and Facilitated Diffusion - BioWiki
http://biowiki.ucdavis.edu/Biochemistry/Transport_and_Kinetics/Passive_and_Faciliated_Diffusion Competition: low
We would like to derive equations which show J as a function of Aout (assuming that Ain is negligible over the time course of measuring the initial flux. This process would lead to the diffusion of many ions across the membrane (down a concentration gradient) until the channel closes (which can be induced by ligand dissociation or other events)
http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Lectures/Membranes/membrane.htm Competition: low
Attachment of the Cytoskeleton and to the Extracellular MatrixIntegrins are proteins that attach to microfilaments on the inside of the cell and to fibronectin on the outside of the cell. As temperature increases, the collisions among particles become more energetic, causing particles to move from areas of higher concentration to lower concentration at a faster rate.Membranes are Selectively PermeableThe membrane is said to be selectively permeable because some substances can pass through quickly while others pass through more slowly or not at all
How does a cell membrane maintain homeostasis within a cell? - Yahoo!7 Answers
http://au.answers.yahoo.com/question/index?qid=20070617081904AA9Od6L Competition: low
The phospholipids have 2 definite ends, a hydrophilic (focusing to the outside and inside of the membrane) and a hydrophobic one (forming the center of the membrane). As this occurs the cytoplasm generates an over all negative charge 2 K as opposed to 3 Na on the outside, giving the extracellular fluid a positive charge
http://quizlet.com/3335028/transports-across-cell-membrane-flash-cards/ Competition: low
liver cells breaking down red blood cells What happens to vesicle after it is formed during endocytosis? It must fuse with the lysozyme and contents get digested. nutrients are brought in by pinocytosis Why do cells stop growing and dividing once they reach a certain size?They cannot get enough material through their surface to supply their volume
http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect09.htm Competition: low
This pump works independent of concentration gradient The pump is an integral membrane protein Binds 3 Na+ inside cell ATP is hydrolyzed and phosphate group transferred to protein when the pump is phosphorylated, its configuration changes and it opens up the Na+ to the outside of the cell The Na+ are released (the altered configuration does not favor the binding of Na+) Two K+'s from the outside now bind to the altered protein The binding of the K+ causes the protein to lose its phosphate group Now that the phosphate group is gone, the altered protein reverts back to its original shape, which was open to the inside of the cell The original shape does not favor the binding of K+, so these are released
http://www.uic.edu/classes/bios/bios100/lectures/diffusion.htm Competition: low
This pump works independent of concentration gradient The pump is an integral membrane protein Binds 3 Na+ inside cell ATP is hydrolyzed and phosphate group transferred to protein when the pump is phosphorylated, its configuration changes and it opens up the Na+ to the outside of the cell The Na+ are released (the altered configuration does not favor the binding of Na+) Two K+'s from the outside now bind to the altered protein The binding of the K+ causes the protein to lose its phosphate group Now that the phosphate group is gone, the altered protein reverts back to its original shape, which was open to the inside of the cell The original shape does not favor the binding of K+, so these are released
Cell membrane - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Cell_Membrane Competition: low
Ion channels, proton pumps, G protein-coupled receptor Lipid anchored proteins Covalently bound to single or multiple lipid molecules; hydrophobically insert into the cell membrane and anchor the protein. The cell membrane consists primarily of a thin layer of amphipathic phospholipids which spontaneously arrange so that the hydrophobic "tail" regions are isolated from the surrounding polar fluid, causing the more hydrophilic "head" regions to associate with the intracellular (cytosolic) and extracellular faces of the resulting bilayer
In facilitated diffusion do molecules move down a concentration gradient or against a concentration gradient
http://wiki.answers.com/Q/In_facilitated_diffusion_do_molecules_move_down_a_concentration_gradient_or_against_a_concentration_gradient Competition: low
Answer History Related Answers: In facilitated diffusion do molecules move down a concentration gradient or against a concentration gradient? Facilitated diffusion falls under passive transport, along with simple diffusion and osmosis
How do molecules move across the cell membrane? - Yahoo! Answers
http://answers.yahoo.com/question/index?qid=20090117013240AArVjB7 Competition: low
Movement of molecules across cell membranes - The Human Physiology Diffusion Diffusion is essentially the movement of molecules from a region of higher concentration to a region of lower concentration as a result of thermal motion. The amount of material crossing a surface per unit of time is called flux and depends upon the difference in concentrations between two compartments where movement is potentially going to occur
Cell Membranes Problem Set
http://www.biology.arizona.edu/cell_bio/problem_sets/membranes/07t.html Competition: low
If the number of particles gets so high on one side of the membrane that they interfere with diffusion through the protein channel, then we observe a limit to the rate of diffusion at the point of saturation. If the particles can only pass through protein channels, then the rate of diffusion is determined by the number of channels as well as the number of particles
Cell Membrane
http://www.biology-questions-and-answers.com/cell-membrane.html Competition: low
This situation is called saturation of the transport proteins and it represents the point at which the maximum transport capacity of the substance across the membrane is achieved. Active transport works to maintain or increase the concentration gradient of a substance between two regions while passive transport acts in a manner to reduce the concentration gradient
Yahoo! Answers - Why does the process of diffusion occur?
http://malaysia.answers.yahoo.com/question/index?qid=20081129223213AAnGPAX Competition: low
When the cell needs to create an equal solute concentration, passive transport across a biological membrane work comes in play: The partially permeable nature of membranes of cells allows some material to move across the membrane while others cannot. Osmosis is the passive movement of water molecules across a partially permeable membrane from a region of lower solute concentration to a region of higher solute concentration
Diffusion Through Cell Membranes
http://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter38/diffusion_through_cell_membranes.html Competition: low
If the concentration of a molecule is greater outside a cell than inside the cell then, on average, more molecules will randomly enter the cell, than leave the cell
http://employees.csbsju.edu/hjakubowski/classes/ch331/transkinetics/oldiffusioneq.html Competition: low
We would like to derive equations which show J as a function of Aout (assuming that Ain is negligible over the time course of measuring the initial flux. That is, the flux is measured for a short enough time that the relative concentrations of A on both sides of the membrane does not change significantly
http://uk.answers.yahoo.com/question/index?qid=20100128122549AA2GfQ3 Competition: low
Diffusion is a time-dependent process, constituted by random motion and If the particles all randomly move around or diffuse in the water, then the particles will eventually become distributed randomly and uniformly. molecules can get into and out of the cell depending on the conc gradiet this process only allows specific molecules into the cell, only the ones recognised by the membrane proteins
How do materials move through the cell membrane
http://wiki.answers.com/Q/How_do_materials_move_through_the_cell_membrane Competition: low
Last edit by Dfoofnik Answer History Related Answers: How do materials move through the cell membrane? Materials move into and out of cells through active transport, diffusion, and osmosis. What is it called when materials move through a cell membrane without using energy? Passive transport does not use energy to pass through a cell membrane
Transport Across Cell Membranes
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/D/Diffusion.html Competition: low
The accumulation of sodium ions outside of the cell draws water out of the cell and thus enables it to maintain osmotic balance (otherwise it would swell and burst from the inward diffusion of water). These organic molecules exert an osmotic effect that, if not compensated for, would cause the cell to take in so much water that it would swell and might even burst
Facilitated diffusion - definition from Biology-Online.org
http://www.biology-online.org/dictionary/Facilitated_diffusion Competition: low
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. types of diffusion, simple diffusion is where substances pass through the phospholipid layer, and facilitated diffusion is when it passes through the proteins
http://ww2.valdosta.edu/~bergstrm/audesrk4.htm Competition: low
Hint: Use differentially permeable membranes and remember to include a hypothesis, experimental design and how the results would be recorded and al so state what the expected results would be for your experiment
http://uk.answers.yahoo.com/question/index?qid=20070119132522AA50ZMt Competition: low
As an example of facilitated diffusion, glucose molecules diffuse by simple diffusion only very slowly across a cell membrane since glucose is not readily soluble in the phospholipid bilayer. Member since: 19 January 2007 Total points: 946 (Level 2) Add Contact Block Facilitated diffusion occurs in our individual cells to allow important ions and large molecules to enter (ones that cannot pass by regular diffusion)
Movement of molecules across cell membranes - Biology Online
Solute flux magnitude through a mediated transport system is positively correlated with the number of transporters, the rate of conformational change in the transporter protein, and the overall saturation of transporter binding sites which is dependent on the solute concentration and affinity of the transporter. There will be a net diffusion of both compartments leading to diffusion equilibrium with no change in volume in either compartment if the compartments are separated by a membrane that is permeable to both a solute and water
One form of passive transport utilizes protein channels, whereby protein molecules in the membrane form a tunnel through which polar molecules may diffuse without ever coming in contact with the fatty acids. In this process, proteins called carrier proteins bond with the molecule on one side of the membrane, move through the membrane, and then release it on the other side
Net movement of water is from a hypotonic solution (low solute concentration or high water concentration) to hypertonic solution (higher solute concentration or lower water concentration). hypotonic solution - lower solute concentration or higher water concentration outside of cell hypertonic solution- higher solute concentration or lower water concentration outside of cell isotonic - solute concentration or water concentration outside of cell same as inside of cell hypotonic solution - there is a net movement of water into the cell (may cause lysis) hypertonic solution - there is no net movement of water out of the cell isotonic - there is no net movement of water across the membrane hypotonic solution - may cause lysis in animals, turgor pressure develops in plants hypertonic solution - causes crenation in animals, causes plasmolysis in plants See the diagram below to better understand the effects of different solutions Collect, display, and interpret data Complete potato disc assignment
Semipermeable membrane - Wikipedia, the free encyclopedia
The rate of passage depends on the pressure, concentration, and temperature of the molecules or solutes on either side, as well as the permeability of the membrane to each solute. A semipermeable membrane, also termed a selectively permeable membrane, a partially permeable membrane or a differentially permeable membrane, is a membrane that will allow certain molecules or ions to pass through it by diffusion and occasionally specialized "facilitated diffusion"
Passive and Facilitated Diffusion - BioWiki
We would like to derive equations which show J as a function of Aout (assuming that Ain is negligible over the time course of measuring the initial flux. This process would lead to the diffusion of many ions across the membrane (down a concentration gradient) until the channel closes (which can be induced by ligand dissociation or other events)
Attachment of the Cytoskeleton and to the Extracellular MatrixIntegrins are proteins that attach to microfilaments on the inside of the cell and to fibronectin on the outside of the cell. As temperature increases, the collisions among particles become more energetic, causing particles to move from areas of higher concentration to lower concentration at a faster rate.Membranes are Selectively PermeableThe membrane is said to be selectively permeable because some substances can pass through quickly while others pass through more slowly or not at all
How does a cell membrane maintain homeostasis within a cell? - Yahoo!7 Answers
The phospholipids have 2 definite ends, a hydrophilic (focusing to the outside and inside of the membrane) and a hydrophobic one (forming the center of the membrane). As this occurs the cytoplasm generates an over all negative charge 2 K as opposed to 3 Na on the outside, giving the extracellular fluid a positive charge
liver cells breaking down red blood cells What happens to vesicle after it is formed during endocytosis? It must fuse with the lysozyme and contents get digested. nutrients are brought in by pinocytosis Why do cells stop growing and dividing once they reach a certain size?They cannot get enough material through their surface to supply their volume
This pump works independent of concentration gradient The pump is an integral membrane protein Binds 3 Na+ inside cell ATP is hydrolyzed and phosphate group transferred to protein when the pump is phosphorylated, its configuration changes and it opens up the Na+ to the outside of the cell The Na+ are released (the altered configuration does not favor the binding of Na+) Two K+'s from the outside now bind to the altered protein The binding of the K+ causes the protein to lose its phosphate group Now that the phosphate group is gone, the altered protein reverts back to its original shape, which was open to the inside of the cell The original shape does not favor the binding of K+, so these are released
This pump works independent of concentration gradient The pump is an integral membrane protein Binds 3 Na+ inside cell ATP is hydrolyzed and phosphate group transferred to protein when the pump is phosphorylated, its configuration changes and it opens up the Na+ to the outside of the cell The Na+ are released (the altered configuration does not favor the binding of Na+) Two K+'s from the outside now bind to the altered protein The binding of the K+ causes the protein to lose its phosphate group Now that the phosphate group is gone, the altered protein reverts back to its original shape, which was open to the inside of the cell The original shape does not favor the binding of K+, so these are released
Cell membrane - Wikipedia, the free encyclopedia
Ion channels, proton pumps, G protein-coupled receptor Lipid anchored proteins Covalently bound to single or multiple lipid molecules; hydrophobically insert into the cell membrane and anchor the protein. The cell membrane consists primarily of a thin layer of amphipathic phospholipids which spontaneously arrange so that the hydrophobic "tail" regions are isolated from the surrounding polar fluid, causing the more hydrophilic "head" regions to associate with the intracellular (cytosolic) and extracellular faces of the resulting bilayer
In facilitated diffusion do molecules move down a concentration gradient or against a concentration gradient
Answer History Related Answers: In facilitated diffusion do molecules move down a concentration gradient or against a concentration gradient? Facilitated diffusion falls under passive transport, along with simple diffusion and osmosis
How do molecules move across the cell membrane? - Yahoo! Answers
Movement of molecules across cell membranes - The Human Physiology Diffusion Diffusion is essentially the movement of molecules from a region of higher concentration to a region of lower concentration as a result of thermal motion. The amount of material crossing a surface per unit of time is called flux and depends upon the difference in concentrations between two compartments where movement is potentially going to occur
Cell Membranes Problem Set
If the number of particles gets so high on one side of the membrane that they interfere with diffusion through the protein channel, then we observe a limit to the rate of diffusion at the point of saturation. If the particles can only pass through protein channels, then the rate of diffusion is determined by the number of channels as well as the number of particles
Cell Membrane
This situation is called saturation of the transport proteins and it represents the point at which the maximum transport capacity of the substance across the membrane is achieved. Active transport works to maintain or increase the concentration gradient of a substance between two regions while passive transport acts in a manner to reduce the concentration gradient
Yahoo! Answers - Why does the process of diffusion occur?
When the cell needs to create an equal solute concentration, passive transport across a biological membrane work comes in play: The partially permeable nature of membranes of cells allows some material to move across the membrane while others cannot. Osmosis is the passive movement of water molecules across a partially permeable membrane from a region of lower solute concentration to a region of higher solute concentration
Diffusion Through Cell Membranes
If the concentration of a molecule is greater outside a cell than inside the cell then, on average, more molecules will randomly enter the cell, than leave the cell
We would like to derive equations which show J as a function of Aout (assuming that Ain is negligible over the time course of measuring the initial flux. That is, the flux is measured for a short enough time that the relative concentrations of A on both sides of the membrane does not change significantly
Diffusion is a time-dependent process, constituted by random motion and If the particles all randomly move around or diffuse in the water, then the particles will eventually become distributed randomly and uniformly. molecules can get into and out of the cell depending on the conc gradiet this process only allows specific molecules into the cell, only the ones recognised by the membrane proteins
How do materials move through the cell membrane
Last edit by Dfoofnik Answer History Related Answers: How do materials move through the cell membrane? Materials move into and out of cells through active transport, diffusion, and osmosis. What is it called when materials move through a cell membrane without using energy? Passive transport does not use energy to pass through a cell membrane
Transport Across Cell Membranes
The accumulation of sodium ions outside of the cell draws water out of the cell and thus enables it to maintain osmotic balance (otherwise it would swell and burst from the inward diffusion of water). These organic molecules exert an osmotic effect that, if not compensated for, would cause the cell to take in so much water that it would swell and might even burst
Facilitated diffusion - definition from Biology-Online.org
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. types of diffusion, simple diffusion is where substances pass through the phospholipid layer, and facilitated diffusion is when it passes through the proteins
Hint: Use differentially permeable membranes and remember to include a hypothesis, experimental design and how the results would be recorded and al so state what the expected results would be for your experiment
As an example of facilitated diffusion, glucose molecules diffuse by simple diffusion only very slowly across a cell membrane since glucose is not readily soluble in the phospholipid bilayer. Member since: 19 January 2007 Total points: 946 (Level 2) Add Contact Block Facilitated diffusion occurs in our individual cells to allow important ions and large molecules to enter (ones that cannot pass by regular diffusion)
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