3. What happens when a cell is subjected to a solution where the water concentration is equal to that inside the cell (isotonic solution)?

Explanation:

In an isotonic solution the relative concentration of solute and water are equal on both sides of the membrane.so there is no water movement so there is no change in the size of the cell but, when a cell is placed in a hypotonic solution water will enter the cell and the cell will swell.

not sure if this is what you'r looking for eubacteria and archaebacteria