Download NAME DATE___________ CHAPTER 7 CELL STRUCTURE AND

NAME ______________________________________ DATE___________
CHAPTER 7
CELL STRUCTURE AND FUNCTION
Below is a diagram of a “cell membrane”.
1. Why is the cell membrane called a “bilayer”?
2. In which group of macromolecules do the molecules
that make the bilayer belong?
3. What is the function of the cell membrane?
Below is a diagram of a section of cell membrane enlarging the phospholipids.
4. What do the terms “hydrophilic” and “hydrophobic” mean?
5. Why is the hydrophilic portion of each phospholipid molecule oriented
toward the extracellular fluid (outside the cell) or the cytoplasm (inside the
cell)?
Below is a diagram showing the addition of a dye (food coloring) to a beaker of water.
6. What process is this demonstration depicting?
7. Using the term “concentration”, explain what takes place with the
dye molecules.
Below is a diagram showing the process of “simple diffusion” across a “selectively permeable membrane”.
8. Show the concentration gradient by labeling the side of the cell with the
highest concentration (use a + sign) and the side with the lowest
concentration (use a – sign) of solute.
9. Let’s say that the blue dots represent sugar molecules. If the
extracellular concentration of sugar was 6g/L in the beginning, what could
the intracellular concentration be in the beginning?
10. Using the same concentration of solute, what would the final solute
concentration be on both the outside and inside of the cell?
Below is a diagram representing “osmosis” through a cell membrane. The green dots are solute molecules and the
blue/ white molecules are water.
A
B
11. Which side of the membrane (A or B) has the highest water concentration?
12. Draw an arrow showing the direction water would move.
13. How many water molecules would be on each side when the system has
reached equilibrium?
Below is a diagram showing the process of osmosis in two different cell types. The arrows represent the movement
of water.
1
2
3
15. Which cells are plant cells (top or bottom)? How do you
know?
+
16. Label the 3 different sets of cells with the following
appropriate term: Isotonic, Hypertonic, and Hypotonic.
17. What would happen to a red blood cell if it was placed in
pure water (no solute)?
Below is a diagram representing 3 forms of cellular transport.
18. What types of molecules have to move by “facilitated” diffusion?
19. What are the purple objects imbedded in the cell membrane of
this diagram?
20. What is the difference between “passive” and “active” transport?
21. What is the purpose of “ATP” in this diagram?
Below is a diagram showing both unicellular and multicellular organisms.
25. One advantage of being multicellular is “cellular specialization”.
What does this term mean and how is it an advantage over being
unicellular?
Below are two diagrams representing levels of “cellular organization”. Be familiar with this concept.