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5 Written questions

5 Matching questions

  1. Transport Across Cell Membranes: Selective Transport
  2. The Fluid-Mosaic Model
  4. Plasmolysis
  5. Two types of Endocytosis:
  1. a the movement of only certain substances across the cell membrane
  2. b a) phagocytosis - when cells "eat" by taking in large particles or other cells
    b) pinocytosis - when cells "drink" by taking in droplets of fluid
  3. c Cell membrane molecules are in constant motion (drifting past each other) resulting in:
    a) membrane flexibility
    b) cell's ability to change shape
  4. d Loss of water in a plant cell resulting in WILTING
  5. e the reverse of endocytosis, whereby the membrane of vesicles or vacuoles fuses with the cell membrane and the stored contents are expelled from the cell.

5 Multiple choice questions

  1. Cell membranes are semi-permeable allowing some materials to cross, while excluding others. They can select a) by particle size
    - small enough to enter membrane - O2 H2O
    - too large to cross - sugar
    b) particular materials to transport across (they bind to chemicals based on their size shape or charge)
  2. - salts - atoms - viruses
    - sugar - ions - bacteria
    - proteins (7? this is what was in the notes)
    most organelles are surrounded by membranes with the same structure as a cell membrane
  3. each phospholipid molecule has a head that is hydrophilic (water-loving) and two tails that are hydrophobic (water-fearing)
  4. movement across cell membranes without an input of energy
    2 reasons molecules move.
    1. Brownian Motion
    2. Concentration gradients
  5. Know and be able to label a phospholipid bilayer diagram

5 True/False questions

  1. Protein position within a membrane:
    Integral proteins
    Peripheral proteins are partially embedded in the inside or outside surface of the membrane


  2. The activities of a living cell depend on the ability of its membrane todiffusion of molecules across the cell membrane by way of transport proteins.


  3. Brownian Motionin a liquid or gas, particles are in constant, random motion


  4. Active Transportthe movement of molecules and ions against the concentration gradient which requires ATP energy and carrier proteins to pump these molecules from an area of low solute concentration to an area of high solute concentration.


  5. Transport Across Cell Membranes: Equilibriuma state at which molecules are evenly distributed (the concentration is equal throughout the medium)
    - molecules continue moving but equilibrium is maintained


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