| http://digfir-published.macmillanusa.com/hm_custom_osu/hmlsu_wischusen_f13_lab5_prelab1.html | Chapter 2. Movement of Materials Across the Cell Membrane I
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| http://digfir-published.macmillanusa.com/hm_custom_osu/hmlsu_wischusen_f13_lab5_prelab1_dlap.xml | DLAP questions | 51dd709a757a2e5836000015 |