The cellular membrane is often called the fluid mosaic model. To what does this refer? 1. The fluidity of hydrophobic regions and proteins, and the mosaic pattern of hydrophilic regions. 2. The fluidity of phospholipids and the pattern of proteins in the membrane. 3. The fluidity of proteins and the pattern of phospholipids in the membrane. 4. The ability of proteins to switch sides in the membranes.

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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.