AS Module 1

 

10.3 Plasma membranes

Print out the questions below and answer using the information from section 10.3.

  1. What are the special lipids in plasma membranes called?

    2. _________________________________________________

  2. Explain the meanings of hydrophobic and hydrophilic. Which parts of phospholipids are hydrophobic and hydrophilic?

    3. _______________________________________________________________________

  3. What is the name of the model used to describe plasma membranes?

    4. _____________________________________

    (4) Label the diagram below.

    wpe7.jpg (18928 bytes)

     
  4. What three factors affect the rate of diffusion?

    5. (a)

    (b)

    (c)

  5. Write down Fick’s Law.

    6.  

  6. What is the difference between osmosis and diffusion?

    7. ____________________________________________________________________________

  7. What are the main differences between active transport and facilitated diffusion?

    8. ____________________________________________________________________________

  8. Give one example of a process for which endocytosis is used and one example for exocytosis.

            ___________________________________________________________________________

     

 

Self assessment

Tick the box when you can do it. If you can’t then try working through it or revising it again. If you don’t understand then ask your biology teacher for help!

Explain the arrangement of phospholipids, proteins and carbohydrates ¨

in the fluid-mosaic model of membrane structure

Name 3 factors which affect the rate of diffusion ¨

State Fick’s Law ¨

Explain how osmosis occurs and what is meant by osmotic potential ¨

Explain how membrane proteins and energy changes allow active transport ¨

and facilitated diffusion to occur

Back to 10.3