7th Grade Science Student ebook

6.1 THE STRUCTURE AND FUNCTION OF THE CELL MEMBRANE

CHAPTER 6: CELL PROCESSES

6.1 Section Review

1. List four functions of the cell membrane.


2. How is the cell membrane like a soap bubble?


3. What is diffusion? Name one example of diffusion.


4. What is osmosis? What structure in a plant cell helps protect it
   from osmosis?


5. For each situation below, state whether water will move into
   the cell, move out of the cell, or stay the same.


6. How is active transport different from diffusion?


7. Name two situations in which a cell would need to use active
   transport instead of diffusion.


8. Explain why cells are so small.


9. Which figure below has the highest surface-area-to-volume
   ratio? Explain your reasoning.

The owner of this plant watered

it with salt water by mistake. The

pictures below show what

happened to the plant at 8:00 a.m.,

12:00 p.m., and 4:00 p.m.

1. Describe what happened to the
   plant and its cells over time.


2. Explain why you think these
   things happened. State your
   explanation as a hypothesis.


3. Design an experiment to test if
   your hypothesis is correct.