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The tonicity of solution between cell wall and cell membrane in a plasmolysed cell?
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How does tonicity relate to osmosis?
Tonicity refers to the measure of the effective osmotic pressure gradient between two solutions. The higher the difference in the tonicity between the two solutions, the more osmosis transpires.
Why plasmolysis is unlikely to occur in nature?
Plasmolysis is the separation of plant cell cytoplasm from the cell wall as a result of water loss. It is unlikely to occur in nature, except in severe conditions. Plasmolysis is induced in the laboratory by immersing a plant cell in a strongly saline or sugary solution, so that water is lost by osmosis. If onion epidermal tissue is immersed in a solution of calcium nitrate, cells rapidly lose water by osmosis and the protoplasm of the cells shrinks (Web Figure 3.8.A). This occurs because the calcium and nitrate ions freely permeate the cell wall and encounter the selectively permeable plasma membrane. The large vacuole in the center of the cell originally contains a dilute solution with much lower osmotic pressure than that of the calcium nitrate solution on the other side of the membrane. The vacuole thus loses water and becomes smaller. The space between the cell membrane and the cell wall enlarges and the plasma membrane and the protoplasm within it contract to the center of the cell. Strands of cytoplasm extend to the cell wall because of plasma membrane-cell wall attachment points. Plasmolysed cells die unless they are transferred quickly from the salt or sugar solution to water.
What change will occur if a piece of peeled potato is dropped in a concentrated sugar solution?
The potato may show some shrinking, but the more observable change is loss in mass of the peeled potato. Water will move out of the potato by osmosis. In osmosis, the water moves from the area of higher concentration to the area of lower concentration. There is lower water concentration outside of the potato because of the high amount of sugar dissolved in it. Depending on the concentration differences between the potato and the solution, water loss will continue until an equilibrium is reached. The potato piece will become flaccid (floppy)/plasmolysed, because of the water loss it has suffered. Shrinkage results from loss of turgor pressure in the potato, as a result of it becoming plasmolysed.
How are hypertonic solution and hypotonic solutions similar?
In osmosis, the hypertonic solution is one with a higher solute concentration over the semi-permeable membrane and the hypotonic solution is one with a lower solute concentration over the semi-permeable membrane. The similarities between these two is that both contain a solute and both involve water which is essential in osmosis. Also, the semi-permeable membrane plays a very important roll on how the water moves. It moves from the lower solute concentration to the higher solute concentration.
What is the fluid between the nuclear membrane and the plasma membrane called?
Cytoplasm
Why is the tonicity of a solution important?
TONICITY describes the degree to which a solution can exert an osmotic pressure on a membrane. Particles which can freely cross a membrane do NOT affect tonicity. This is because they will freely move in order to achieve equilibrium. Therefore, tonicity is dictated by the particles than can't cross the membrane (such as proteins, which are usually too large to cross, or highly charged particles). Non-permeable particles will therefore force water to cross the membrane towards them in order to achieve equilibrium - they can therefore be said to exert an osmotic pressure on the membrane.Solutions can be HYPERTONIC (i.e. the surrounding solution contains a larger concentration of these non-permeable particles than inside the cell, causing water to LEAVE the cell) or HYPOTONIC (i.e. the opposite, where water moves INTO the cell). They can also be ISOTONIC (there is equilibrium of the non-permeable particles, so no water moves).There is a very important distinction between tonicity and OSMOLARITY: osmolarity ALSO takes into account the particles that CAN cross the membrane (the permeable ones). So a solution could be both HYPEROSMOLAR and ISOTONIC at the same time - one set of particles will be able to freely cross the membrane, so there will no net change in cell volume.
What fills the space between cell wall and membrane after plasmolysis?
The cell membrane is a selectively permeable membrane that will only let water and solutes across it. The cell membrane freely allows pretty much everything to pass across it, meaning that things unable to pass the membrane back up and push it away from the cell wall. Therefore the gap is filled with the SUGAR SOLUTION that is surrounding the cell.
What's the difference between isotonicity and isoosmosis?
Tonicity is measure of the effective of osmotic pressure. Osmosis is the minimum pressure which needs to be applied to a solution.
How does tonicity relate to osmosis?
Tonicity refers to the measure of the effective osmotic pressure gradient between two solutions. The higher the difference in the tonicity between the two solutions, the more osmosis transpires.
What happens to a animal cell when in a hypertonic solution?
1. When a plant cell is immersed in a solution with low water potential, the water potential of its cell sap is higher than that of the solution outside its cell.2. water will leave the cell by osmosis. As the cell loses water the vacuole decreases in size and the cytoplasm shrinks away from the cell wall.3. the shrinkage of cytoplasm and cell membrane away from the cell wall is known as plasmolyses or dehydrated cell. the cell is said to be plasmolysed. A plasmolysed cell can be restored to its original state by placing it in water or in a solution with high water potential.
What is the difference between osmolarity and tonicity?
Tonicity refers to the relative concentration of solute particles inside a cell, with respect to the concentration outside the cell. Osmolarity refers to the movement of water from the inside to the outside of a cell, and vice versa
Why plasmolysis is unlikely to occur in nature?
Plasmolysis is the separation of plant cell cytoplasm from the cell wall as a result of water loss. It is unlikely to occur in nature, except in severe conditions. Plasmolysis is induced in the laboratory by immersing a plant cell in a strongly saline or sugary solution, so that water is lost by osmosis. If onion epidermal tissue is immersed in a solution of calcium nitrate, cells rapidly lose water by osmosis and the protoplasm of the cells shrinks (Web Figure 3.8.A). This occurs because the calcium and nitrate ions freely permeate the cell wall and encounter the selectively permeable plasma membrane. The large vacuole in the center of the cell originally contains a dilute solution with much lower osmotic pressure than that of the calcium nitrate solution on the other side of the membrane. The vacuole thus loses water and becomes smaller. The space between the cell membrane and the cell wall enlarges and the plasma membrane and the protoplasm within it contract to the center of the cell. Strands of cytoplasm extend to the cell wall because of plasma membrane-cell wall attachment points. Plasmolysed cells die unless they are transferred quickly from the salt or sugar solution to water.
Solution that causes cells to lose water?
It's the hypertonic solution. It contains a higher osmole concentration than the fluid present inside the cell "the cytosol" ,so the water inside the cells comes out in order to dilute the hyper-tonic solution in an attempt to make a balance between the two sides of the semipermeable membrane ( The cell membrane is a semipermeable membrane that separate the fluid present inside the cell and that outside it).
What is the cellular structure that separates the cytoplasm from the external environment?
The Cell Membrane separates the cell from its environment and prevents its contents from mixing with the outside solution.
Which are isotonic?
Isotonic solution is a solution in which the concentration of solutes is essentially equal to that of cytosol of the cell placed in that solution. There is no net osmotic pressure on a membrane placed between 2 isotonic solutions.
What change will occur if a piece of peeled potato is dropped in a concentrated sugar solution?
The potato may show some shrinking, but the more observable change is loss in mass of the peeled potato. Water will move out of the potato by osmosis. In osmosis, the water moves from the area of higher concentration to the area of lower concentration. There is lower water concentration outside of the potato because of the high amount of sugar dissolved in it. Depending on the concentration differences between the potato and the solution, water loss will continue until an equilibrium is reached. The potato piece will become flaccid (floppy)/plasmolysed, because of the water loss it has suffered. Shrinkage results from loss of turgor pressure in the potato, as a result of it becoming plasmolysed.
How are hypertonic solution and hypotonic solutions similar?
In osmosis, the hypertonic solution is one with a higher solute concentration over the semi-permeable membrane and the hypotonic solution is one with a lower solute concentration over the semi-permeable membrane. The similarities between these two is that both contain a solute and both involve water which is essential in osmosis. Also, the semi-permeable membrane plays a very important roll on how the water moves. It moves from the lower solute concentration to the higher solute concentration.
