character: Biology Basics Bot
topic: Membrane Composition and Function
grade: 9
subject: Science
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character: Cell Structure Expert
topic: Membrane Lipid Bilayer
grade: 9
subject: Science
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character: Science Explorer
topic: Transport Mechanisms Across Cell Membranes
grade: 9
subject: Science
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character: Cell Biology Guide
topic: Functions of Protein Channels in Membranes
grade: 9
subject: Science
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