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What is called when a molecule moves across a semipermable membrane into a region of a higher concentration?
When a molecule moves to a higher concentration it needs help of a pump. We call this facilitated diffusion. Osmosis only deals with the movement of water.
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What molecule moves across the membrane During osmosis?
Water molecules move across the membrane during osmosis. Osmosis is the movement of water molecules from an area of lower solute concentration to an area of higher solute concentration across a semi-permeable membrane.
What is the movement of small molecule across a cell membrane up its concentration gradient called?
eflux
The net direction that an ion or molecule moves is?
determined by the concentration gradient and electrical gradient across the membrane. If the net movement of ions or molecules is down their concentration gradient and towards the opposite electrical charge, they will move across the membrane.
Under what condition would a molecule need to be actively transport across a membrane?
A molecule would be actively transported when an equal concentration of solutes exist on either side of the cell membrane.
What typebof molecular movement consists of one-way diffusion across a semipermable membrane?
The type of molecular movement that involves one-way diffusion across a semipermeable membrane is called osmosis. Osmosis specifically refers to the diffusion of water molecules from an area of lower solute concentration to an area of higher solute concentration through the membrane. This process helps to balance solute concentrations on both sides of the membrane and is crucial for maintaining cellular homeostasis.
Is diffusive equilibrium possible for the molecule that is impermeable?
No, diffusive equilibrium requires a concentration gradient and the ability of the molecule to pass through a membrane. If a molecule is impermeable, it cannot move freely across the membrane, so diffusive equilibrium is not possible for that molecule.
What molecule uses osmosis?
Water is the primary molecule that undergoes osmosis. Osmosis is the movement of water molecules across a semipermeable membrane from an area of higher water concentration to an area of lower water concentration in order to equalize the concentrations on both sides of the membrane.
What molecule is moving in Osmosis?
Water molecules are the molecules that move in osmosis across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.
What is the type of molecule that is moving in osmosis?
The molecule that moves during osmosis is water. Water moves across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration in order to equalize the concentration on both sides.
How is it possible for some molecules to be at equilibrium across a biological membrane and yet not be at the same concentration on both sides?
The equilibrium distribution of a molecule across a membrane depends on concentration and membrane potential. A charged molecule will respond to both components of the electrochemical gradient and will distribute accordingly. K+ ions for example, are at equilibrium across the plasma membrane even though they are 30-fold more concentrated inside the cell. the difference in concentration is balanced by the membrane potential, which is more negative on the inside. The membrane potential opposes the movement of cations to the outside of the cell.
How do carrier protiens transport substances across cell membrane?
Carrier proteins facilitate the transport of substances across the cell membrane by binding to the specific molecules they transport and undergoing conformational changes to move the molecules across the membrane. This process is often referred to as facilitated diffusion. It allows for the transport of specific molecules, such as glucose or ions, across the membrane, down their concentration gradient.
The use of energy to move substances across a cell membrane describes?
Active transport, which requires energy in the form of ATP to move substances against their concentration gradient across a cell membrane. This process involves specific protein pumps that bind to the molecule being transported, consuming ATP to change conformation and move the molecule across the membrane.
