Which is an example of passive transport? a) A membrane protein uses a hydrogen ion concentration gradient to transport sucrose against its concentration gradient and into a cell b) An ion channel permits sodium ions to diffuse through a cell membrane c) A pump uses ATP as an energy source to transport hydrogen ions out of a cell d) A cell takes in particles by pinocytosis e) The sodium potassium pump transports ions from one side of the membrane to the other, against a concentration gradient

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Q: In which situation would passive transport not use a transport protein for entry into a cell

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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.