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Biomembranes I: Membrane Structure and Transport
Concept 1: Membrane Structure
   Practice (1 page)
   Review (1 page)
Concept 2: Osmosis: Movement of Water Across Membranes
   Practice (1 page)
   Review (4 pages)
Concept 3: Selective Permeability of Membranes
   Practice (1 page)
   Review (4 pages)
Concept 4: Passive and Active Transport
   Practice (2 pages)
   Review (2 pages)
Concept 5: Mechanisms of Active Transport
   Practice (1 page)
   Review (4 pages)
Concept 1: Membrane Structure
Membranes consist of a phospholipid bilayer combined with a variety of proteins in a fluid mosaic arrangement.
The surfaces of cell membranes are hydrophilic (water-loving); the interiors are hydrophobic.

Hydrophilic molecules tend to interact with water and with each other. Hydrophobic molecules avoid interaction with water and tend to interact with other hydrophobic molecules.