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When a cell membrane protein moves a solute in the opposite direction as the concentration gradient?
Wiki User
∙ 12y ago
as the concentration gradient increases at the solute side.
make the question more clear.
Wiki User
∙ 12y ago
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What is a Reveres Osmosis?
reverse osmosismay be define as a separation operation involve transfer by concentration gradient of a solvent through membrane in to a mixture solute and solvent , the transfer of solvent in the opposite direction is effected by imposing the pressure . is known as reverse osmosis
What conditions are necessary for diffusion to take place?
The conditions necessary for diffusion is firstly a semi permeable membrane, and a concentration gradient for the movement of molecules from higher concentration to lower concentration. The size of the molecules should be small enough to pass easily through the membrane.
How does active transport move things?
The active transport is carried out with the help of carrier proteins and in several cases these carriers behave like enzymes. The action of such enzymes is a bit different as the solute is transported unchanged to the other side of the membrane.
What happens when sucrose is taken up by active transport?
Outside the cell is high concentration of hydrogen ions and low concentration of sucrose. Inside, is the opposite, low concentration of hydrogen ions, and high concentrations of sucrose. Cells use ATP to pump a hydrogen ion across the cell membrane, against the concentration gradient, and when the hydrogen ion goes to re-enter, it goes through a Sucrose-proton cotransporter. This means that the hydrogen ion (proton) take a sucrose molecule with it when it goes though the membrane.
Why do you call diffusion and osmosis passive transport?
Simply, it is the opposite of active transport. It does not "spend" chemical energy. Since passive transport is diffusion, molecules will move from higher areas of concentrations to lowers areas of concentrations and no outside force is needed (unlike active transport).
How does a cell maintain differences in concentration of certain ions on either side of the plasma membrane?
Cells maintain unequal concentrations of ions on opposite sides of a cell membrane through active transport.
What is a Reveres Osmosis?
reverse osmosismay be define as a separation operation involve transfer by concentration gradient of a solvent through membrane in to a mixture solute and solvent , the transfer of solvent in the opposite direction is effected by imposing the pressure . is known as reverse osmosis
What conditions are necessary for diffusion to take place?
The conditions necessary for diffusion is firstly a semi permeable membrane, and a concentration gradient for the movement of molecules from higher concentration to lower concentration. The size of the molecules should be small enough to pass easily through the membrane.
What is a concentration gradient?
It is the difference in concentration (molecules of a solute per volume of solution) between two locations. Because of the motion of molecules, they are said to diffuse (move, spread) from an area of greater concentration to an area of lesser concentration. Some molecules are always moving in the opposite direction, but the overall trend is "down" the gradient until equilibrium is established between the two regions. And, generally, the larger the gradient or difference, the faster the rate of the diffusion.
What term describes the difference between the numbers of hydrogen ions on opposite sides of the membrane?
Diffusion and it does not have to be through a semi permeable membrane.
How does active transport move things?
The active transport is carried out with the help of carrier proteins and in several cases these carriers behave like enzymes. The action of such enzymes is a bit different as the solute is transported unchanged to the other side of the membrane.
Which requires the use of energy to move a molecule across a cell membrane?
No. Water molecules can osmotically cross the cell membrane because they are small enough that their polarity does not matter. Then there are porins. Channels across the cell membrane that water molecules use.
What is cell membrane pumps?
cell membrane pumps use energy to force molecules in a direction opposite of natural.
Why is diffusion also called active transport?
Diffusion and active transport are not the same thing. Diffusion is when molecules pass from an area of high concentration to an area of low concentration. They travel down a concentration gradient. They do this naturally, like if perfume is sprayed at one end of the room, it spreads to the other end, because there is a low concentration of spray at the other end, see? Active transport is when a cell actively moves molecules from one side of its membrane to the other. It is often travelling up a concentration gradient, so it is going from an area of low concentration to an area of high concentration- the opposite of diffusion.
How do molecules diffuse?
Movement of solutes across a lipid bilayer plasma membrane can occur in many ways:1. Osmosis: diffusion of water across membranes to balance solute concentrations.- No energy req- Water passes through membrane via aquaporins, pores in the membrane permeable only to water.2. Simple diffusion: diffusion of only small, hydrophobic (nonpolar) molecules across a membrane down their concentration gradient.- No energy req- Only moves small nonpolar molecules down their concentration gradient3. Facilitated diffusion (passive transport): uses transmembrane protein transporters (channels and carriers) to move polar molecules (ions) across a membrane- No energy required- Channel proteins: Allow for rapid diffusion of specific ions down their concentration gradient- Can be activated by:- Voltage- Ligand- Mechanical force- Carrier proteins: Allow for selective diffusion of specific ions down their concentration gradient.- Uniport carriers: only transport one specific ion down its concentration gradient- Symport carriers: move two different types of ions in the same direction.- Antiport carriers: moves two different ions in opposite directions-Can use the energy created moving one molecule down its concentration gradient to move an ion against its concentration gradient- Carrier proteins exhibit saturation, competition, and specificity.4. Active transport: transport of solutes across a membrane against their concentration gradient.- ATP req- Uses carrier proteins- Leads to creation of potential energy stored in electrochemical gradients
What happens when sucrose is taken up by active transport?
Outside the cell is high concentration of hydrogen ions and low concentration of sucrose. Inside, is the opposite, low concentration of hydrogen ions, and high concentrations of sucrose. Cells use ATP to pump a hydrogen ion across the cell membrane, against the concentration gradient, and when the hydrogen ion goes to re-enter, it goes through a Sucrose-proton cotransporter. This means that the hydrogen ion (proton) take a sucrose molecule with it when it goes though the membrane.
What is the difference between passive active transport homeostasis?
Active transport is the movement of molecules across a membrane requiring energy to be expanded by the cell.ACTIVE TRANSPORT REQUIRES ENERGY.Passive transport is diffusion across a membrane requiring only random motion of molecules with no energy expanded by the cell. Osmosis is an example of this.PASSIVE TRANSPORT REQUIRES NO ENERGY.Other answersActive transport requires energy often, in a cell, in the form of ATP (adenine triphosphate), like a sodium-potassium channel in a cell.Passive transport happens without the use of energy. An example of this is osmosis.Active transport is the movement of solutes against concentration gradient or electrical gradient. The solutes pass from a low solute concentration to a higher solute concentration, therefore it is also known as "uphill transport" whereas, Passive Transport is the movement of solutes towards the concentration gradient or electrical gradient. The solutes pass from a high solute concentration to a low solute concentration, therefore it is also known as "downhill transport".Passive transport occurs when the concentration of something on one side of membrane is different from the concentration on the other side. It occurs when that substance can pass through the membrane, and always in the direction of more -> less. No energy is required to make the substance move; in fact, this movement generates energy. This is like rolling a rock down a hill--it just does it on its own.Active transport occurs in the opposite direction, from less -> more. It requires energy for transport. This is like rolling a rock up a hill--you have to push it the entire way!Both involve the transport of a substance across a membrane, and the change in concentrations on different sides of a membrane. Both are also important to the proper functioning of a cell.Active transport requires energy, but passive transport requires none.Active transport requires a special protein to make the transport occur, but passive transport requires none.
