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13.1 The Transport of Molecules Across a Membrane May Be Active or Passive
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13.2 Two Families of Membrane Proteins Use ATP Hydrolysis to Pump Ions and Molecules Across Membranes
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13.3 Lactose Permease Is an Archetype of Secondary Transporters That Use One Concentration Gradient to Power the Formation of Another
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13.4 Specific Channels Can Rapidly Transport Ions Across Membranes
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13.5 Gap Junctions Allow Ions and Small Molecules to Flow Between Communicating Cells
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13.6 Specific Channels Increase the Permeability of Some Membranes to Water
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