Diffusion Gradient


Q.

Part A Auxin is a plant hormone that diffuses out of plant cells through PIN proteins. A scientist measures the concentration of auxin inside and outside of two different plant cells. Both plant cells have the same number of PIN proteins on their cell membranes for auxin to diffuse through. Which plant cell has the greatest diffusion rate of auxin out of the cell (µmol/s)?

Forced Choice:

  • Plant cell 1
  • Plant cell 2
  • They will have the same rate of diffusion

Explain the reasoning for your choice about which plant cell has the greatest diffusion rate of auxin out of the cell.

Part B The scientist takes new measurements of auxin concentrations in a different pair of cells. These two plant cells also have the same number of PIN proteins for auxin to diffuse through. Which plant cell has the greatest diffusion rate of auxin out of the cell (µmol/s)?

Forced Choice

  • Plant cell 3
  • Plant cell 4
  • They will have the same rate of diffusion

Explain the reasoning for your choice about which plant cell has the greatest diffusion rate of auxin out of the cell.

 

Audiences:

Undergraduate

Topics:

DiffusionFluxPhysiologyPhysiology

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