3. Fill in this summary table to compare and contrast types of transport. For secondary, first you need primary active transport to make the gradient. Is cellular energy required? (YES/NO) What powers this transport? (Diffusion/ATP) Is a membrane protein required? (YES/NO) Simple diffusion Facilitated Primary diffusion active transport Secondary active transport

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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.