1. Flip-Flop is considered the LEAST likely to happen of the four membrane movements because it is the LEAST energetically favorable movement of a single fatty acid. For this question DRAW the action of a one phopholipid being flipped from outside facing plasma membrane, to the inside facing plasma membrane. On your drawing put an X near areas of the phospholipids that do NOT want to interact during this process.

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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.