Plasma Membranes

• Active transport

  The active movement of substances from a low concentration to a higher concentration (up their concentration gradient) with the use of energy in the form of ATP.
• Amphipathic


  A molecule with both hydrophobic and hydrophilic parts.
• Exocytosis

  The bulk transport of substances out of a cell using a vesicle that fuses with the plasma membrane using energy in the form of ATP.
• Hydrophilic 


  A molecule which is attracted to water
• Integral membrane protein


  A type of protein bound to the membrane with strong interactions
• Osmosis


  The net movement of water molecules across a partially permeable membrane from a region of high water potential to a region of lower water potential without the use of energy.
• Plasmolysis 


  The effect produced by placing plant cells in a hypertonic solution causing the cell to shrivel from water loss, resulting in the membrane pulling away from the rigid cell wall.
• Turgid


  A term used to describe a cell that is swollen due to large amounts of fluid uptake.