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How do solutes and other materials move across membranes?

Topic

Membrane Structure and Function

Framing Question

How do solutes and other materials move across membranes?

Learning Objectives

  • Given a set of molecules of differing solubility in water, predict their relative rates of diffusion across a membrane bilayer.
  • Compare and contrast the properties and functions of channels and carriers.
  • Given data about the relative concentrations of solutes on both sides of a membrane, predict the direction of solute flow.
  • Design an experiment that distinguishes between different modes of crossing the membrane, such as diffusion, facilitated diffusion, active transport.

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