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In case sucrose does diffuse out of the membrane will the equilibrium of water and sucrose be ever reached?
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Do living Cells reach equilibrium?
Yes. They are constantly involved in the process called Dynamic Equilibrium. For example, when more Sucrose is available in the cytoplasm - then the Cell makes less of the Sucrase enzyme.
Why is it that when you put a potato in a high concentration of sucrose solution does its weight decrease?
This is because the potato, which is mostly water, is in a hypertonic solution (a solution with less water and more solute --here, sucrose-- than the potato). Since the solutions want to reach equilibrium (equal amounts of sucrose and water in both the solution and the potato), water diffuses out of the potato and sucrose diffuses into it. The potato loses its water weight, and sucrose doesn't replace the weight lost, the potato weighs less.
In plants that use an apoplastic route for sucrose to move from mesophyll cells to the phloem what would NOT occur if a protein was inserted into the plasma membrane that allowed hyd?
hydrogen ions to leak across it?Feedback on your choices will appear here. Sucrose would be moved more quickly back into the cell cytoplasm by cotransport.The apoplastic space would become more basic.The rate of phloem loading would decrease.The concentration of sucrose in the apoplastic space would increase.Proton pumps in the plasma membrane would run at the same rate or even a little faster.A.B.C.D.E.Keywords:Submit Score& Logout
What does fructose and glucose make?
sucrose
What is the compound for sucrose?
I think that the compound for sucrose is C12H22O11.
Why did osmosis, but not diffusion of sucrose molecules, occur across the dialysis membrane containing 20% sucrose solution?
Sucrose cannot diffuse across a dialysis tubing. This is because it's size is too large to go through the tubing. Water can diffuse across.
Is the Visking tubing a partailly permeable membrane and why?
Yes, it is a partially permeable membrane. It allows certain substances like glucose and water molecules to diffuse through but not large molecules like starch and sucrose. Selectively permeable.
What can you conclude about the permeability of potato cytoplasm with respect to sucrose and water molecules?
H20 molecules can pass through the membrane freely, however sucrose molecules are too large.
Does sugar diffuse through the cell membrane?
No. Only non-polar, small molecules can pass through a membrane by simple diffusion. A sucrose molecule is too large a molecule to pass through a membrane by simple diffusion, however, it can pass through a plasma membrane (but not any artificial membranes like Visking tubings) by facilitated diffusion, i.e. through transport proteins(specific carriers for sucrose) embedded in the membranes. ! =)
What is an osmotically active substance?
It is a solute that causes osmosis to occur. For instance, if a solution contains sucrose and the membrane is impermeable to sucrose,, water will move out of the cell and into the solution to dilute it. Hence the solution is hypertonic. Sucrose would be considered an osmotically active solution in this case because it induces osmosis of water across a membrane.
How is dialysis membrane selectively permeable?
a dialysis membrane is selectively permeable, it is used in experiments to simulate cellular membranes, and it is permeable to water but not to sucrose.
Do living Cells reach equilibrium?
Yes. They are constantly involved in the process called Dynamic Equilibrium. For example, when more Sucrose is available in the cytoplasm - then the Cell makes less of the Sucrase enzyme.
Why is a dialysis membrane not permeable to sucrose?
No; the sucrose molecule (as a disaccharide) is too large to pass through by passive diffusion. Glucose, on the other hand, (a monosaccharide) is able to permeate the dialysis tubing. In the body, glucose/sucrose is transmitted across membranes though the use of active/facilitated diffusion.
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 is it that when you put a potato in a high concentration of sucrose solution does its weight decrease?
This is because the potato, which is mostly water, is in a hypertonic solution (a solution with less water and more solute --here, sucrose-- than the potato). Since the solutions want to reach equilibrium (equal amounts of sucrose and water in both the solution and the potato), water diffuses out of the potato and sucrose diffuses into it. The potato loses its water weight, and sucrose doesn't replace the weight lost, the potato weighs less.
Is there sucrose in feces?
No, there is not sucrose in feces. This is because sucrose is only in food that is not digested.
In plants that use an apoplastic route for sucrose to move from mesophyll cells to the phloem what would NOT occur if a protein was inserted into the plasma membrane that allowed hyd?
hydrogen ions to leak across it?Feedback on your choices will appear here. Sucrose would be moved more quickly back into the cell cytoplasm by cotransport.The apoplastic space would become more basic.The rate of phloem loading would decrease.The concentration of sucrose in the apoplastic space would increase.Proton pumps in the plasma membrane would run at the same rate or even a little faster.A.B.C.D.E.Keywords:Submit Score& Logout
