Biology Chapter 5

11 Questions | Total Attempts: 80

SettingsSettingsSettings
Please wait...
Homeostasis Quizzes & Trivia

HOMEOSTASIS AND TRANSPORT


Questions and Answers
  • 1. 
    The following are examples of passive transport except...
    • A. 

      Diffusion

    • B. 

      Osmosis

    • C. 

      Facilitated diffusion

    • D. 

      Diffusion through ion channels

    • E. 

      Sodium-potassium pump

  • 2. 
    The movement of molecules down a concentration gradient, that is, from area of higer concentration to area of lower concentration is called                  
  • 3. 
    This process is entirely driven by kinetic energy the molecules posses.  Because of their kinetic energy, molecules are in constant motion.  they move randomly, travelling in a straight line until they hit an object, such as another molecule.  When they hit something, they rebound and move off in a new direction, travelling in another straight line. If no object blocks their movement, they continue on their path.  Thus molecules tend to move "down" their concentration gradient, from areas where they are more concentrated to areas where they are less concentrated.  What form of passive transport is being described by this paragraph? (can you explain the paragraph to your teacher verbally?)
  • 4. 
    When the concentration of the molecules of a substance is the same throughout a space, a state of                            exitsts; but the random motion of molecules continues even in this state.
  • 5. 
    If a molecule can fit through or pass through a membrane, the form of active transportation that creates equilibrium across (that is on either side of) the membrane is                        .           
  • 6. 
    The following are ways or mechanisms cells deal with osmosis: the movement of water either into or out of the cell, toward where the concentration greater
    • A. 

      Contractile vacuoles which are organelles that remove water

    • B. 

      The cells pump out solutes out to keep the concentration gradient low

    • C. 

      Swelling of the cell until it is stopped by cell wall

    • D. 

      All of the above

  • 7. 
    In cells that lack the compensation mechanism to deal with hypotonic or hypertonic environments, thier fates include
    • A. 

      bursting cytolysis

    • B. 

      Shrinkage

    • C. 

      Swelling

    • D. 

      All of the above

  • 8. 
    Facilitated diffusion is different from simple diffusion in all of the following except
    • A. 

      Facilitated occurs across a membrane

    • B. 

      Facilitated diffusion occurs when the molecule is too large to diffuse across the membrane

    • C. 

      Facilitated diffusion uses carrier proteins for the molecules to pass down their concentration

    • D. 

      Facilitated diffusion is really not diffusion because the molecules do not go from higher to lower concentration