Cells in isotonic, hypotonic, and Hypertonic solutions. Aim: How do we predict the effect of a hypotonic, hypertonic, and isotonic solution on a cell?. Do Now: What do you think will happen to cells placed in a strong salt solution? How do you explain the process of osmosis in this condition?.
Cells in isotonic, hypotonic, and Hypertonic solutions
The plasma membrane is selectively permeable.
This means that only some molecules can cross.
Small uncharged molecules like O2, CO2 and H2O pass.
Large or charged molecules like proteins or ions cannot pass.
Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.
Osmosis is the diffusion of water across a plasma membrane.
Osmosis occurs when there is an unequal concentration of water on either side of the selectively permeable plasma membrane.
CAN cross the plasma membrane.
Tonicity is the osmolarity of a solution--the amount of solute in a solution.
Solute--dissolved substances like sugars and salts.
Tonicity is always in comparison to a cell.
The cell has a specific amount of sugar and salt.
cell wall as cell expands to equilibrium
Plant growth – most likely to be affected