Because a fluid membrane is essential for many metabolic process, it is important for organisms to maintain constant membrane fluidity. Which one of the following statements is least true? During adaptation to lower temperatures, an organism may increase its production of lipids with less saturated acyl chains. A variety of different lipids are present in biological membranes to help maintain fluidity over a range of temperatures. O Cholesterol helps to maintain constant membrane fluidity over a range of temperatures by restricting the movements of nearby acyl chains with its rigid and planar ring struture, thereby decreasing membrane fluidity. Cholesterol helps to maintain constant membrane fluidity over a range of temperatures by promoting close packing of nearby acyl chains, becasuse the hydrophobic cholesterol can interact with the acyl chains favorably.

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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.