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Diffusion and Membrane Permeability Quiz

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Diffusion and Membrane Permeability Quiz

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Questions and Answers

Which statement about the movement of solutes through a membrane is true?

The rate of facilitated diffusion of a solute is limited by the number of transporters in the membrane at any given time. (correct)

A single ion, such as K+, can diffuse through more than one type of channel.

Lipid-soluble solutes diffuse more readily through the phospholipid bilayer of a plasma membrane than do water-soluble ones.

Diffusion of a solute through a membrane is considerably quicker than diffusion of the same solute through a water layer of equal thickness.

In terms of osmolality and tonicity, what effect does an impermeable solute in the ECF have on a cell?

Causes the cell to burst due to increased osmotic pressure.

Causes the cell to swell due to water influx.

Causes the cell to shrink due to water loss. (correct)

Causes no change in intracellular volume.

What happens when a cell is placed in a solution that is hyperosmotic but not hypertonic?

Cell undergoes apoptosis.

Water flows into the cell. (correct)

Water flows out of the cell.

No net movement of water across the cell membrane.

Which process is responsible for the movement of both an ion and an organic molecule across a membrane?

Cotransport Signup and view all the answers

If the concentration of a substance increases in the ECF compartment and the cell membrane is impermeable to this substance, what term describes the ECF?

Hypertonic Signup and view all the answers

When considering diffusion rates, which statement is correct?

Lipid-soluble solutes diffuse more readily through a plasma membrane than water-soluble ones. Signup and view all the answers

What effect does an isotonic solution have on intracellular volume?

Leads to no net movement of water across the cell membrane. Signup and view all the answers

Which property makes facilitated diffusion different from simple diffusion?

Involves the use of transport proteins or carriers. Signup and view all the answers

What happens to a cell in a hypotonic solution compared to its original state?

The cell swells due to water intake. Signup and view all the answers

If a solution causes no change in intracellular volume, what term describes that solution?

Isotonic Signup and view all the answers