Discovering the Lowest Concentration Of Lead Ions Needed to Cause the Loss of Partial Permeability of Cell Membranes.

... Discovering the Lowest Concentration Of Lead Ions Needed to Cause the Loss of Partial Permeability of Cell Membranes Aim: To discover the lowest concentration of lead ions needed to cause the loss of partial permeability of cell membranes. The cell membrane I will use to conduct this experiment will be the outer fleshy leaves of red onions. Background information The plasma membrane of living cells is a partially permeable membrane, and osmosis is the principal mechanism by which water enters and leaves plant and animal cells. Whether the net direction of movement is into or out of the cells depends on whether the water potential of the cell solution is more negative or less negative than the water potential of the external solution. When the external water potential is the same as that of the cell, there is no net movement of water in any direction. When the external water potential

want to read more? →