Diffusion and Osmosis Lab
by Rob Swatski, Associate Professor of Biology at HACC-York Campus (HACC, Central Pennsylvania's Community College) http://robswatski.virb.com/
Terms in this set (36)
A substance that is dissolved in a solution.
In a solution, the substance in which the solute dissolves.
A mixture that forms when one substance (the solvent) dissolves another (the solute).
A property of a plasma membrane that allows some substances to cross more easily than others.
The passive movement of molecules from an area of higher concentration to an area of lower concentration.
The passive movement of specific molecules across a membrane, from high to low concentration, that is aided by transport proteins.
The diffusion of water across a selectively permeable membrane.
The ability of a solution to cause a cell to gain or lose water; it depends partly on the concentration of non-penetrating solutes relative to the inside of a cell.
A solution with the same concentration of water and solutes as inside a cell, resulting in the cell retaining its normal shape because there is no net movement of water.
A solution with a solute concentration that is less than that inside the cell, which causes a net movement of water into the cell.
A solution with a solute concentration that is greater than that inside the cell, which causes a net movement of water out of the cell.
The destruction of red blood cells after exposure to a hypotonic solution, due to the gain of water through osmosis.
The shriveling of a cell after exposure to a hypertonic solution, due to the loss of water through osmosis.
A phenomenon in plant cell in which the cytoplasm shrivels and the plasma membrane pulls away from the cell wall; occurs when the cell loses water when exposed to a hypertonic environment.
The movement of substances from an area of low concentration to an area of high concentration that uses energy provided by ATP or a difference in electrical charges across a cell membrane.
What is the relationship between rate of diffusion and molecular weight?
Lower molecular weight substances diffuse faster; Higher molecular weight substances diffuse slower.
What does heating water do to the rate of diffusion of tea?
Higher temperatures increase the rate of diffusion.
What organs does the dialysis tubing represent?
Kidney tubules, intestines
Which solute diffused through the dialysis tube membrane - starch or glucose?
Which solute did not diffuse through the dialysis tube membrane - starch or glucose?
How did we know that glucose diffused out of the dialysis tube membrane?
Positive results of the Benedict's test when we tested the beaker water.
How did we know that starch did not diffuse out of the dialysis tube membrane?
Negative results of the Iodine test when we tested the beaker water.
In which solution did the potato slices feel most turgid?
In which solution did the potato slices feel most flaccid?
Plant cells do best in _____ environments because their cells have the highest turgor pressure.
Which of these solutions is isotonic to plant cells - 0.9% NaCl, tap water, or 10% NaCl?
Which of these solutions is hypertonic to plant cells - 0.9% NaCl, tap water, or 10% NaCl?
Which of these solutions is hypotonic to plant cells - 0.9% NaCl, tap water, or 10% NaCl?
What happened to the central vacuole of the plant cell when exposed to a hypertonic environment?
Water was lost from the central vacuole, causing the turgor pressure to drop. This resulted in plasmolysis as the plasma membrane contracted inwards, away from the cell wall.
Which of these solutions more closely resembles the tonicity of blood plasma - 0.9% NaCl, tap water, or 10% NaCl?
Which of these solutions will cause red blood cells to undergo crenation - 0.9% NaCl, tap water, or 10% NaCl?
Which of these solutions will cause red blood cells to undergo hemolysis - 0.9% NaCl, tap water, or 10% NaCl?
The intrinsic molecular kinetic energy that is the driving force of diffusion.
The pressure inside of a cell as the cytoplasm pushes itself against the cell wall due to the uptake of water.
A measure of the total solute concentration per liter of solution.
In more dilute concentrations of sucrose, the weight of the potato pieces _____ after incubation.
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