Biology homework three assignements Drawiings need to be on seperate piece of paper from the typed answers so I can trace .. I cant draw

Bi 101 Homework 3 Chapters 4-7 Fall 2013 DUE in class Friday Nov. 1 20 Points possible

1. Use a diagram of the endomembrane system to explain how a new protein may be constructed, modified, and exported from the cell. (See your lecture notes from 10121 and 14123, and Figure 4.15 of text.)

2. Draw a generalized diagram of an enzyme, and label the active site and an allosteric sitp. Explain the role of each of these sites, and explain in your own words how enzymes\ *ork. (See Figures 5.10 and 5.15.) \

3. Draw a graph of energy (y-axis) vs. time (x-axis) for an exergonic reaction (shown in figure 5.11). Clearly show the energy of activation, without an enzyme(or catalyst) and with an enzyme.

4. Draw a cell membrane. lnclude generalized types of membrane proteins, as depicted in figure 5.20.

5. Draw diagrams to explain what happens to a cellwhen it is placed in a hypertonic solution, a hypotonic,solution, and an isotonic solution. Explain how the direction of movement of water is involved in the cellular effects. (See Figure 5.23.)

6. Draw and explain the mechanism of the calcium pump, and the sodium-potassium pump. (See figures 5.25 and 5.26.) Why are these called'active transporters"?

7. Diagram the process of receptor-mediated endocytosis, as well as the process of exocytosis. (Figure 5.27 shows both of these.) How are these processes related to the activities of the endomembrane system (question # 1, above).

8. (Chapter 6, figure 6.4) Explain the setup and results of Engelman's classic experiment. Based on the results, what colors of light should be most efficient at stimulating photosynthesis in most plants?

9. See "Overview of Photosynthesis" in Section 6.4. \r/hat is the general summary chemical equation for photosynthesis? Explain (in your own words!), how the light-dependent and light-independent reactions have distinct roles in photosynthesis. (lt will be helpful to read the summary "take-home messages" at the bottom of pages 105, 107, and 109.)

10. See "Overview of Carbohydrate Breakdown Pathways", section 7 .2, andexamine figure 7.3. \I/hat is the overall summary equation for aerobic respiration? What are the three stages of respiration, where in the cell do they occur, and what are the key products of each?