The plasma membrane of P. bursaria is about 56%56% protein and 40%40% phospholipid by weight. How many molecules of membrane lipid are present for each molecule of membrane protein? Assume an average protein ?rMr of 4.8×1044.8×104 and an average phospholipid ?rMr of 750.

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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.