Think back to the BIOL-151 lab where you were introduced to microscopes. What is the formula you used to figure out the diameter of any viewing field once you knew the diameter at a given magnification? (If you do not remember the formula, you will find it in this lab exercise too.) If a cell has a large surface area:volume ratio will the movement of molecules in and out of the cell be faster or slower compared to a cell with a smaller surface area:volume ratio?

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.