Workshop #2

CELL STRUCTURE AND FUNCTION



A. Describe the different organelles of an animal cell listed below using a metaphor.  For example, if you use a factory as the metaphor for the cell.  The mitochondria could be the furnace, ER the hallways.  Justify each description.  Another metaphor might be the kitchen.  Be creative.

  1. cell membrane
 
 

  2. ER
 
 

  3. ribosome
 
 

  4. golgi apparatus
 
 

  5. lysosome
 
 

  6. mitochondrion
 
 

  7. vacuole
 
 

  8. centriole
 
 

  9. nucleus
 

B. Use the algorithm on page three of your Study Guide for a scholarly definition of the golgi apparatus.
 
 
 

C. The following diagram illustrates passive and active transport across a plasma membrane.  Use it to answer questions 1-5.

  1. Which section represents facilitated diffusion?

   How can you tell?

   Does the cell expend energy in this transport?

   Why or why not?

   What types of solute molecules may be moved by this type of transport?
 
 

  2. Which section shows active transport?

   How can you tell?

   Does the cell expend energy in this transport?

   Why or why not?

  3. Which section shows diffusion?

   What types of solute molecules may be moved by this type of transport?

  4. Which of these sections are considered passive transport?

  5. Label the components of the diagram.  Indicate hydrophobic and hydrophilic regions.
 
 

 D. Use the U-tube setup to answer the questions below.

  The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose.  Side A is filled with a solution of 2.0 M sucrose and 1.0 M glucose.  Side B is filled with 1.0 M sucrose and 2.0 M glucose.

  1. Initially, the solution in side A, with respect to that in side B, is
   a. hypotonic.
   b. hypertonic.
   c. isotonic.
   d. lower.
   e. higher.

  2. After the system reaches equilibrium, what changes are observed?
   a. The water level is higher in side A than in side B.
   b. The water level is higher in side B than in side A.
   c. The molarity of glucose is higher in side A than in side B.
   d. The molarity of sucrose has increased in side A.
   e. Both a and c have occurred.

  3. During the period before equilibrium is reached, which molecule(s) will show net movement through the membrane?
   a. water
   b. glucose
c. sucrose
d. water and sucrose
e. water and glucose