101: Cell Membranes, Cell Junctions and Membrane Transport

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1. How do cells recognise other cells?

  • By binding to molecules on the extracellular surface of the plasma membrane
  • By the secretion and absorption of chemical communicants
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2. What are peripheral proteins?

  • Proteins that are not embedded in the lipid bilayer, and are loosely bound to the surface of the membrane
  • Proteins that penetrate the hydrophobic interior of the lipid bilayer

3. What are carrier proteins?

  • Proteins that alter their shapes in order to transport molecules across the cell membrane
  • Proteins that allow molecules to pass freely through them and across the cell membrane

4. What did Singer & Nicolson's theory state?

  • That the cell membrane is studded with proteins, with hydrophilic areas protruding
  • That the cell membrane is coated on both sides with hydrophilic proteins, like a sandwich

5. Can polar or non-polar molecules easily pass through the plasma membrane?

  • Non-polar
  • Polar

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