Leaving Cert. Biology Osmosis

Leaving CertificateBiology

  • Osmosis – The movement of water molecules from a region of high concentration to a region of low concentration
  • Diffusion – The passive movement of particles from a region of high concentration to a region of low concentration
  • Turgor – The normal rigid state of fullness of a cell as a result of the pressure of the contents of the cell against the cell wall
  • Permeable Membrane – Allows all molecules to pass or diffuse through
  • Semi permeable membrane – Only allows some molecules to pass through the molecule
  • Passive transport – The movement of molecules that requires no enery
  • Crenation – The shrivelling of the cell due to water leaving the cell due to solute differences across the cell membrane
  • Hypotonic – Describes a solution whose solute concentration is lower than the solute concentration inside a cell
  • Hypertonic – Describes a solution whose solute concentration is higher than the solute concentration inside a cell
  • Visking Tubing – Type of synthetic tubing that is partially permeable, allowing only water and some other small molecules to pass through its pores.
  • Plasmolysis – When a cell is in a hypertonic environment, the cell will lose water to its surroundings, shrink, and its plasma membrane will pull away from the wall
  • Active Transport – transport of a substance across a cell membrane against the concentration gradient
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