4. A cell with a selectively permeable membrane is in a solution. Urea can diffuse through the membrane (by passive diffusion in either direction) but ions such as Na+, Cl- and K+ cannot. Which of the following is correct? Urea Urea K Urea K* Inside of cell Naci Urea K K* NaCl K NaCl Urea Urea Urea Urea Solution Urea Naci Urea K K+ Selectively permeable Urea K NaCl K Urea NaCl K* Urea NaCl K non-penetrating Naci non-penetrating Urea penetrating membrane A. The solution is hypoosmotic and hypotonic relative to the cell, and the net movement of water is towards the cell B. The solution is hyperosmotic and hypotonic relative to the cell, and the net movement of water is towards the cell C. The solution is isoosmotic and isotonic relative to the cell, and the net movement of water is null D. The solution is hypoosmotic and hypertonic relative to the cell, and the net movement of water is towards the solution E. The solution is isoosmotic and hypertonic relative to the cell, and the net movement of water is towards the solution

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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.