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Biology LibreTexts

2: Membrane Dynamics

  • Page ID
    25081
  • Students investigate the effects of molecule size on diffusion across a synthetic selectively permeable membrane. This investigation includes a brief introduction to osmosis. Additional questions introduce students to the roles of proteins in transporting polar substances across the cell membrane and guide students in analyzing the relative advantages of two different types of model of the cell membrane.

    • 2.1: Membrane Protocol
      Each cell is surrounded by a selectively permeable cell membrane which regulates what gets into and out of the cell. A selectively permeable membrane allows some types of molecules and ions to diffuse across the membrane and prevents other types of molecules and ions from crossing the membrane. For example, oxygen can cross the selectively permeable cell membrane, but large molecules like proteins and DNA cannot cross the cell membrane.
    • 2.2: Membrane Teacher Preparation Notes
      Students investigate the effects of molecule size on diffusion across a synthetic selectively permeable membrane. This investigation includes a brief introduction to osmosis. Additional questions introduce students to the roles of proteins in transporting polar substances across the cell membrane and guide students in analyzing the relative advantages of two different types of model of the cell membrane.