Lab #5 Quiz - Brookdale BIO 105
Define lysis and describe the osmotic condition that would cause an animal cell to lyse. Explain why plant cells never lyse.
Lysis is when an animal cell bursts. It occurs when an animal cell is placed in a hypotonic solution for an extended period of time. Plant cells do not lyse because their cell walls prevent them from bursting.
Solvent
The dissolving agent
Osmosis
The movement of water molecules across a selectively permeable membrane
Diffusion
The net movement of molecules from a high concentration to low concentration
True or False: If a selectively permeable membrane separates two isotonic solutions, osmosis will occur.
True
How is water movement across membranes affected by the above tonic solutions?
increase the influx of water into the cell causing the cell to swell or cause the cell to lose water and shrivel
Isotonic Solution
two solutions are equal in concentration
Crenation
when an animal cell loses water and shrivels up (shrinkage of cells when solution is hypertonic)
Tonicity
Compares the relative concentration of two solutions. Tonicity measures the influence a solution will have on cell volume
What factors affect the rate of diffusion
Temperature, Size of molecule
Cell membranes are selectively permeable. What does this mean?
This means that the cell membrane will allow some substances in or out of the cell, but not other substances.
In a salt water solution name the solute
Water
Solute
What gets dissolved
Hypertonic Solution
the solution with the higher solute concentration
Hypotonic Solution
the solution with the lower solute concentration