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Pre lab

Pre lab. Investigation question: What variables affect the passage of molecules through a cell membrane?. Part I. Adding salt solution to Elodea - cellular level http://www.youtube.com/watch?v=VK-_YHakvho&feature=related Adding distilled water – organism level of organism

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Pre lab

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  1. Pre lab Investigation question: What variables affect the passage of molecules through a cell membrane?

  2. Part I Adding salt solution to Elodea- cellular level • http://www.youtube.com/watch?v=VK-_YHakvho&feature=related Adding distilled water – organism level of organism • http://www.youtube.com/watch?v=H6N1IiJTmnc

  3. Propose at least two alternative hypotheses for your observations. (question 4). • Submit one hypothesis via your student responder.

  4. Some definitions to work with. • Solute: a substance dissolved in a liquid • Solvent: the dissolving medium in a solution. • Concentration: the strength of a solution; number of molecules of a substance in a given volume.

  5. Part II-dialysis model Molecule size investigation (2 students/group) Solute concentration investigation (2 students/group) Homework: plf

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