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Osmosis is Serious Business!

By Troy R. Nash

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Osmosis is Serious Business!

This directed case study involves two “stories,” each one concerned with some aspect of osmosis in living cells. Part I is centered around the effects of a hypertonic environment on plant cells, while Part II focuses on the effects of a hypotonic environment on human cells. After reading the parts, students working in small groups evaluate the information and answer the corresponding questions. This case was designed for use in a non-majors biology course, but could be adapted for use in a majors’ introductory biology course or a high school biology class.

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  • Understand solute concentration and the process of osmosis.
  • Be able to determine the net direction of osmosis in a given situation.
  • Understand osmosis in plant cells and be able to apply the term plasmolysis .
  • Understand osmosis in animal cells and be able to apply the term lysis .

Osmosis; diffusion; tonicity; hypertonic; hypotonic; lysis; plasmolysis; blood cells; fertilizer

  

Subject Headings

EDUCATIONAL LEVEL

High school, Undergraduate lower division

TOPICAL AREAS

TYPE/METHODS

Teaching Notes & Answer Key

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