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Chapter 2: Chemistry Comes Alive: Organic Compounds - page 2 / 4

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Chapter 3: The Plasma Membrane: Structure and Function

III. Figure 1 is a diagram of a portion of a plasma membrane. Select four different colors and color the coding circles and the corresponding structures in the diagram. Then respond to the questions that follow, referring to Figure 3.1 and inserting your answers in the answer blanks.

  • O

    Phospholipid molecules

    • O

      Protein molecules

  • O

    Carbohydrate molecules

A

Figure 1

1. Which molecule “A” or “E” is always located on the intracellular side of the plasma membrane?

_____

  • 2.

    What is the function of cholesterol molecules in the plasma membrane? _________________________

  • 3.

    Name the carbohydrate-rich molecules indicated by bracket at the top surface._______________________

4. Which label: B or C points to the nonpolar region of a phospholipid molecule?

_____________________

5. Does nonpolar mean hydrophobic or hydrophilic?

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

6. Which label, D or E, indicates a peripheral protein and which an integral protein?

__________, ________

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