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A membrane potential is basically the difference between the inside and outside of the cell. Ions are charged, and so will change the membrane potential (the difference between charges on the inside and outside) when they move.
Please see the related link below which includes a diagram of how ions affect membrane potential.
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Are aquaporins involved in osmosis or facilitated diffusion?
Aquaporins are involved in osmosis by facilitating the movement of water molecules across cell membranes. They do not participate in facilitated diffusion, which involves the transport of solutes across membranes with the help of carrier proteins.
Which molecules help control movement of substances through cell membranes?
Proteins such as transporters, channels, and pumps are the main molecules that help control the movement of substances through cell membranes. These proteins facilitate the selective transport of ions, molecules, and other substances into and out of cells, maintaining proper cellular function. Additionally, phospholipids in the membrane also play a role in regulating the movement of substances across the cell membrane.
What is required to transport glucose molecules across the cell membranes of the intestine?
Glucose molecules are transported across the cell membranes of the intestine through facilitated diffusion using glucose transporters (GLUT proteins), particularly GLUT2 and GLUT5. These transporters help facilitate the movement of glucose into intestinal cells for absorption into the bloodstream.
What large molecules use proteins to help move across cell membranes?
Large molecules such as glucose, amino acids, and ions use transporter proteins to help facilitate their movement across cell membranes. These proteins provide a channel or carrier to help these molecules pass through the membrane, overcoming the barrier imposed by the lipid bilayer.
What two types of molecular movement across membranes require vesicles?
Endocytosis and exocytosis are the two types of molecular movement across membranes that require vesicles. Endocytosis involves the engulfment of molecules or particles into a cell by vesicles formed from the cell membrane, while exocytosis involves the release of molecules or particles out of a cell via vesicles fusing with the cell membrane.
What are the differences between hydrophilic and hydrophobic cell membranes and how do these differences impact the movement of molecules across the membrane?
Hydrophilic cell membranes are attracted to water, while hydrophobic cell membranes repel water. The differences impact the movement of molecules across the membrane because hydrophilic molecules can easily pass through hydrophilic membranes, while hydrophobic molecules can pass through hydrophobic membranes. This selective permeability allows the cell to control what substances enter and exit.
Do hydrophilic molecules pass through membranes?
Yes, hydrophilic molecules can pass through membranes, but they typically require the assistance of transport proteins or channels to facilitate their movement across the lipid bilayer.
What has the author Wilfred Donald Stein written?
Wilfred Donald Stein has written: 'The movement of molecules across cell membranes'
How do diffusion and osmosis share similarities in their mechanisms of movement across cell membranes?
Diffusion and osmosis are both passive processes that involve the movement of molecules across a cell membrane from an area of higher concentration to an area of lower concentration. In both processes, no energy is required for the movement of molecules.
What is the difference between channel and carrier proteins in terms of their mechanisms of transporting molecules across cell membranes?
Channel proteins facilitate the passive movement of molecules across cell membranes by creating a pore or channel for them to pass through. Carrier proteins, on the other hand, actively transport molecules by binding to them and undergoing a conformational change to move them across the membrane.
How do molecules diffuse across membranes?
the reach equilibrium
Are aquaporins involved in osmosis or facilitated diffusion?
Aquaporins are involved in osmosis by facilitating the movement of water molecules across cell membranes. They do not participate in facilitated diffusion, which involves the transport of solutes across membranes with the help of carrier proteins.
Which molecules help control movement of substances through cell membranes?
Proteins such as transporters, channels, and pumps are the main molecules that help control the movement of substances through cell membranes. These proteins facilitate the selective transport of ions, molecules, and other substances into and out of cells, maintaining proper cellular function. Additionally, phospholipids in the membrane also play a role in regulating the movement of substances across the cell membrane.
Are aquaporins transport proteins responsible for facilitating the movement of water across cell membranes?
Yes, aquaporins are transport proteins that facilitate the movement of water across cell membranes.
What is required to transport glucose molecules across the cell membranes of the intestine?
Glucose molecules are transported across the cell membranes of the intestine through facilitated diffusion using glucose transporters (GLUT proteins), particularly GLUT2 and GLUT5. These transporters help facilitate the movement of glucose into intestinal cells for absorption into the bloodstream.
Is there another name for carrier proteins?
Yes, carrier proteins are also known as carrier molecules or transport proteins. They facilitate the movement of molecules across cell membranes by binding to specific substances and transporting them across the cell.
What determines the direction of net movement across a cellmembrane?
The direction of net movement across a cell membrane is determined by the concentration gradient of a substance, with molecules moving from an area of high concentration to an area of low concentration. Additionally, the permeability of the membrane to the specific molecules also influences their movement. External factors such as temperature and pressure can also impact the direction of movement across the membrane.
