Which statements are true? Explain why or why not.1 Although lipid molecules are free to diffuse in theplane of the bilayer, they cannot flip-flop across the bilayerunless enzyme catalysts called phospholipid translocatorsare present in the membrane.2 Whereas all the carbohydrate in the plasma mem-brane faces outward on the external surface of the cell, allthe carbohydrate on internal membranes faces toward thecytosol.3 Although membrane domains with different pro-tein compositions are well known, there are at present noexamples of membrane domains that differ in lipid com-position.

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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.