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11 results for “osmosis”

Topics

Cell Transport
Cell Biology

Questions

Why does osmosis not require membrane proteins?Cell Biology · Cell Transport1mWater entering the cell by osmosis. Equal sized potato pieces were placed into a test-tube and covered with a sucrose solution. The test-tube was left for 30 minutes. All other variables were standardised. After 30 minutes, the potato piece had not changed in size. What can be concluded from this result?Cell Biology · Cell Transport2mA plant cell having 0.35M internal concentration was kept in 0.5M sugar solution. Draw an arrow on the diagram in which way osmosis takes place?Cell Biology · Cell Transport2mAll osmosis is diffusion (movement down a gradient), but not all diffusion is osmosis. Justify your answer.Cell Biology · Cell Transport2mWhy does osmosis not require membrane proteins?Cell Biology · Cell Transport2mA cell is actively transporting ions out while water keeps entering by osmosis. How can the cell prevent itself from bursting? Think about contractile vacuoles, ion pumps, and membrane structure?Cell Biology · Cell Transport3mA piece of plant tissue was kept in the following salt concentration. Choose IN or OUT to show the movement of solute and water. | Concentrationof saltsolutionDiffusionosmosis | | --- | | (movement of solute) (movement of water) | | Intra cellular extracellular fld. | | 5% salt10% salt?? | | 10% salt10% salt?? | | 13% water25% water?? | | 4% protein1% protein?? |Cell Biology · Cell Transport4mDescribe the similarities and differences between the processes of diffusion and osmosis.Cell Biology · Cell Transport4mExplain the process of osmosis and describe how it helps maintain cell stability in living organismsCell Biology · Cell Transport6mStudents investigated the effect of concentration of salt solution on the mass of pieces of potato. Which change would improve the accuracy of osmosis experiment using potato cylinders. TOTAL 6 MARKS (a) Select the correct answer. (1 mark) - Boil the pieces of potato at the start. - Leave the skin on some pieces of potato. - Use more concentrations of salt solution (b) After the above experiment, the students noticed that the potato stick with the lowest mass was soft and floppy. Explain why the potato stick had become soft and floppy. (2 marks) The students followed the same experimental procedure with boiled potato sticks and found no overall change in mass in any of the solutions. (c) Suggest why the mass of the boiled potato sticks remained the same. (3 marks)Cell Biology · Cell Transport6m