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                               Biology 11
                           Chapter 6 Worksheet

   1. List three contributions of the plasma membrane

          a. –

          b. –

          c. –

   2. Unlike other macromolecules lipids are defined by their ____________________
      in water. Lipids always have a large amount of ____________ atoms and
      __________atoms and collectively these atoms are known to form
   3. List and describe the three types of lipids found in cells

          a. –

          b. –

          c. –

   4. Describe the reaction that forms a triglyceride

   5. Draw the carbon skeleton structure of steroids

   6. Describe the lipids of archaea bacteria
7. How do glycerophospholipids differ from sphingolipids. What are the two
   categories of sphingolipids

8. What is the basis for Tay-sachs disease

9. Describe fully the energy concepts behind lipid bilayer formation

10. Listed below are people who contributed to our current understanding of the lipid
    bilayer. Describe their contribution and data.

       a. Overton

       b. Langmuir

       c. Gorter & Grendel
       d. Davson & Danielli

       e. Robertson

       f. Singer and Nicolson

11. List the evidence for the fluid mosaic model

       a. –

       b. –

       c. –

12. What is the difference between and IMP or a PMP

13. The exterior surface of an IMP will come into contact with
   ____________________ and therefore have ______________________ amino
14. Consider an ion transporter. (IMP) If this transporter moved protons it would
   have _____________________ amino acids in its interior.
15. How can you extract an IMP.
16. Describe the following types of transport

       a. Diffusion

       b. facilitated diffusion

       c. active transport

17. Explain the structure of Gramicidin and how it works.

18. What are aquaporins

19. What is the difference between and ion gated channel and a voltage gated
    channel. What type of transport is this.

       a. Voltage gated

       b. Ligand gated

20. Describe the Na+/K+ pump. What type of transport is this
21. Explain why a membrane is selectively permeable. Does lipid composition affect
    permeability? Explain

22. What is the difference between saturated and unsaturated fats? If a membrane has
    more unsaturated fats will it be more or less permeable?

23. What is the contribution to cholesterol in cell membranes?

24. What is osmosis? Why is osmosis a spontaneous process?

       a. Hypotonic

       b. Isotonic

       c. hypertonic

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