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Cellular Transport

Diffusion and Osmosis

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Learn about the key factors that affect diffusion and the principles of osmosis. Understand terms such as concentration gradient, water potential, and tonicity.

Learning Outcomes

  • Explore the effect of various factors on the rate of diffusion
  • Work through a molecular view of an osmosis experiment
  • Identify the key differences between diffusion and osmosis
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Concepts Principles and Theories

  • How concentration, molecule size and temperature affect the rate of diffusion 
  • What is meant by diffusion, osmosis, solute, solvent and water potential
  • How solute concentration relates to water potential and the movement of water molecules
  • How the relative solute concentration can be described in terms of tonicity
  • What similarities and differences define diffusion and osmosis 
  • Where examples of diffusion and osmosis occur in real life

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Dr Samuel Egieyeh
University of the Western Cape

"The Learning Science platform, with its interactive animations, provides the students with a basic understanding of the central dogma of molecular biology and provides the link between the basic biotechnology experiments and the complex production process, formulation, and quality control of biologics."



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