Consider the following scenario: Molecule X is highly concentrated outside of a cell membrane. Molecule Y is highly concentrated inside of a cell. To transport more molecule Y into the cell, the cell could use (choose all that apply): a symporter that transports both X and Y into the cell an antiporter that uses ATP hydrolysis to pump Y in and X out an uniporter that passively transports Y into the cell

Consider the following scenario: Molecule X is highly concentrated outside of a cell membrane. Molecule Y is highly concentrated inside of a cell. To transport more molecule Y into the cell, the cell could use (choose all that apply): a symporter that transports both X and Y into the cell an antiporter that uses ATP hydrolysis to pump Y in and X out an uniporter that passively transports Y into the cell

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 6RE

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Listeria, like all bacteria, emit small molecules as waste products or for signaling. Here we will consider a "race" between a Listeria bacterium Mammalian cell (about 1 um across) and a chemical signal it emits while inside a much larger (~ 15 um) mammalian cell. Suppose the Listeria bacterium, when at one end of the mammalian cell, emits a pulse of signaling molecules which begin diffusing through the mammalian cell. The Listeria then moves along a straight line from one end of the mammalian cell to the other. a. Write down the equation for the rms distance, assuming the Listeria diffusion is three-dimensional. Explain in words what the rms distance means (that is, what it tells us about a diffusion process). b. Using a diffusion constant of 200 um? /s, about how long does it take the signaling molecules to reach the other side of the mammalian cell?
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