Fluid Flies Cell membranes balance the need to remain intact with the need to move during function. Researchers studying fruit flies discovered that the cell membranes of these ectothermic animals changed throughout the day. During the night, when the environment was cool, the membranes were composed of mostly unsaturated phospholipids, leading to a very flexible structure. During the day, when the environment was warm, the membranes were composed of mostly saturated phospholipids, leading to a less flexible structure. Use this information and your understanding of biology to answer questions 21-25. 21. The change in the structure of the membrane is likely a case of adaptive plasticity. O True O False

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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.