Chapter 9 – Cellular Respiration: Harvesting Chemical ...



Chapter 9 – Cellular Respiration: Harvesting Chemical Energy – Homework

Watch the following videos and take notes in your BILL:

Mr. Andersen's Cellular Respiration

Mr. Andersen's Anaerobic Respiration

View the following PREZI – take notes if you choose:

Cellular Respiration Prezi – use Firefox to view – will not open on Chrome

Read Chatper 9 in your text and answer the following:

1. Write the basic balanced equation for cellular respiration.

2. Go back to question 1 and your balanced equation. Identify which one of the three

reactions of cellular respiration each part of your equation is from.

(e.g. which reaction has glucose as a requirement etc.)

3. In the conversion of glucose and oxygen to carbon dioxide and water, which

molecule(s) is reduced? Explain how you know. Which molecule is oxidized?

Explain how you know.

4. Construct a table showing the three main reactions of cellular respiration. For each

reaction show the following information:

Location in the cell, Function of the reaction, Requirements, and Products.

5. Explain why the energy investment phase of Glycolysis is necessary.

6. Discuss why Glycolysis is considered to be one of the first metabolic pathways to have

evolved.

7. Describe the role of oxygen in cellular respiration.

8. Contrast and compare substrate-level phosphorylation versus oxidative

phosphorylation. Identify which stage of cellular respiration each occurs.

9. Speculate on what is the adaptive value of having ATP synthase in the inner

membrane instead of the outer membrane of the mitochondria.

10. Consider a muscle cell (high metabolic rate) and a fat cell (low metabolic rate).

Discuss how these two cells types will likely compare in terms of the number of

mitochondria per cell and structure of their mitochondria.

11. Why is the process of chemiosmosis also called a proton-motive force?

12. Discuss the adaptive value of fermentation? Explain if a yeast cell if given a choice

would prefer to conduct fermentation or cellular respiration.

13. In the 1930’s, some physicians prescribed low doses of a compound called

dinitrophenol (DNP) to help patients lose weight. This unsafe method was

abandoned after some patients died. DNP uncouples the chemiosmotic machinery by

making the lipid bilayer of the cristae leaky to H+. Explain how DNP caused weight

loss.

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