Diffusion across a Selectively Permeable Membrane
Students investigate the effects of molecule size on diffusion across a synthetic selectively permeable membrane. This investigation includes observation and analysis of osmosis (diffusion of water across a selectively permeable membrane). Additional questions guide students in analyzing the relative advantages of different types of model of the cell membrane.
The Teacher Preparation Notes provide instructional suggestions and background information and explain how this activity is aligned with the Next Generation Science Standards.
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Hands-on Activities for Teaching Biology to High School and Middle School Students