Ch 7 Online Quiz

Has anyone completed the quiz, yet? It's due Tues.

no…im pretty sure the due date got moved back along with everything else. there is a new schedule on the moodle.

Thanks a million!

Also, thank you!

You're right. This one did get moved back. It's due FRIDAY, APRIL 9th.

Thanks this helped me get caught up a bunch!

Here are the answers:

1. Which of the compounds listed below link (or links) glycolysis and the citric acid cycle to the mitochondrial electron transport chain?

E Both a and c

Textbook Reference: 7.1 How Does Glucose Oxidation Release Chemical Energy? pp. 141–142 and 7.2 What Are the Aerobic Pathways of Glucose Metabolism? pp. 144–145 and 7.4 How Does the Oxidation of Glucose Form ATP? pp. 148–:149

In the complete oxidation of glucose, 6 CO2 molecules are formed per glucose oxidized. Choose from the list below the correct numbers of CO2 molecules released by glycolysis (gly), the citric acid cycle (CAC) and pyruvate oxidation (pyr).
D) gly 0; CAC 4; pyr 2
Textbook Reference: 7.5 Why Does Cellular Respiration Yield So Much More Energy Than Fermentation? p. 153

The activity of the glycolytic enzyme, phosphofructokinse, is subject to regulation. Which of the statements given below about this regulation is true?

A) ATP is both a substrate and an allosteric effector of the enzyme.

Textbook Reference: 7.6 How Are Metabolic Pathways Interrelated and Controlled? p. 156

Glycolysis
is the conversion of glucose to two molecules of pyruvate; is an exergonic reaction; uses ATP in its initial steps; is an oxidation/reduction process. E ALL OF THE ABOVE
Textbook Reference: 7.2 What Are the Aerobic Pathways of Glucose Metabolism? pp. 142–144

The synthesis of ATP from ADP and Pi is a _ reaction. In mitochondria, ATP synthesis is driven by the flow of _ down the concentration and electrical gradient established by ___.
c. endergonic; protons; the electron transport
Textbook Reference: 7.4 How Does the Oxidation of Glucose Form ATP? pp. 151–152

6. Which of the following reactions is not an oxidation–reduction reaction?
b. R–CH=CH–CH3 + H2O ↔ RCH2–CH(OH)–CH3
Textbook Reference: 7.1 How Does Glucose Oxidation Release Chemical Energy? and 7.2 What Are the Aerobic Pathways of Glucose Metabolism? pp. 139–142 and pp. 145–147

7. The electron transport chain of mitochondria
b. contains cytochromes and proteins containing flavins (FAD).
Textbook Reference: 7.4 How Does the Oxidation of Glucose Form ATP? pp. 148–150

8. A suspension of yeast supplied with glucose as its source of energy was transferred to an anaerobic environment. What would happen to the rate of glucose utilization and the rate of ethanol production after the transfer?
c. Both glucose usage and ethanol production would increase.
Textbook Reference: 7.3 How Is Energy Harvested from Glucose in the Absence of Oxygen? pp. 149–150

9. Triglycerides are major energy storage molecules. How is the complete oxidation of triglycerides to CO2 and water related to the oxidation of glucose?
e. Both b and c

10. The mitochondrial ATP synthase
d. makes ATP at the expense of the proton gradient established by electron transport
Textbook Reference: 7.4 How Does the Oxidation of Glucose Form ATP? pp. 150–151

11. The end-product(s) of glycolysis is/are
d. pyruvate, ATP, and NADH.
Textbook Reference: 7.2 What Are the Aerobic Pathways of Glucose Metabolism? p. 142

12. Most of the ATP that is made during the complete oxidation of glucose to CO2 and water
a. is made by the mitochondrial ATP synthase.
Textbook Reference: 7.2 What Are the Aerobic Pathways of Glucose Metabolism? pp. 144–145, 7.4 How Does the Oxidation of Glucose Form ATP? pp. 149–150 and 7.5 Why Does Cellular Respiration Yield So Much More Energy Than Fermentation? p. 153

13. Fermentation
a. results in the formation of lactic acid or ethanol.
Textbook Reference: 7.3 How Is Energy Harvested from Glucose in the Absence of Oxygen? pp. 147–148

14. Which of the following statements about the citric acid cycle is false?
a. The cycle releases less energy than glycolysis.
Textbook Reference: 7.2 What Are the Aerobic Pathways of Glucose Metabolism? pp. 145–147

15. What is the metabolic fate of pyruvate in anaerobic muscle?
d. It is reduced to lactate.
Textbook Reference: 7.3 How Is Energy Harvested from Glucose in the Absence of Oxygen? pp. 147–148

16. Reagents, such as dinitrophenol, increase the permeability of the mitochondrial inner membrane to protons. The addition of dinitrophenol to a suspension of animal cells should
b. inhibit mitochondrial ATP synthesis.
Textbook Reference: 7.4 How Does the Oxidation of Glucose Form ATP? pp. 148–151

17. Cyanide inhibits the enzyme in the mitochondrial electron transport chain that reduces O2 to water. Suppose that you add cyanide to a suspension of muscle cells from a rat. Which statement given below is the most accurate with respect to the effects of cyanide on glucose catabolism?
d. The citric acid cycle would be inhibited, but glycolysis would not. Lactic acid accumulates.
Textbook Reference: 7.3 How Is Energy Harvested from Glucose in the Absence of Oxygen? pp. 147–148

18. Acetyl CoA is
e. Both b and d
Textbook Reference: 7.6 How Are Metabolic Pathways Interrelated and Controlled? pp. 156–157

19. The conversion of malate to oxaloacetate in the citric acid cycle takes place with the conversion of NAD+ to NADH. In this reaction, NAD+ is
e. Both b and c
Textbook Reference: 7.2 What Are the Aerobic Pathways of Glucose Metabolism? pp. 146–147

20. The mitochondrial electron transport chain
d. oxidizes the intermediate electron carriers, NADH and FADH2
Textbook Reference: 7.4 How Does the Oxidation of Glucose Form ATP? pp. 150–151

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