Name: 
 

Chapter 9 Online Questions



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

Which of the following statements concerning the metabolic degradation of glucose (C6H12O6) to carbon dioxide (CO2) and water is (are) true?
a.
The breakdown of glucose to carbon dioxide and water is exergonic.
b.
The breakdown of glucose to carbon dioxide and water has a free energy change of -686 kcal/mol.
c.
The breakdown of glucose to carbon dioxide and water involves oxidation-reduction or redox reactions.
d.
Only A and B are correct.
e.
A, B, and C are correct.
 

 2. 

Which of the following statements is (are) correct about an oxidation-reduction (or redox) reaction?
a.
The molecule that is reduced gains electrons.
b.
The molecule that is oxidized loses electrons.
c.
The molecule that is reduced loses electrons.
d.
The molecule that is oxidized gains electrons.
e.
Both A and B are correct.
 

 3. 

Where does glycolysis takes place?
a.
mitochondrial matrix
b.
mitochondrial outer membrane
c.
mitochondrial inner membrane
d.
mitochondrial intermembrane space
e.
cytosol
 

 4. 

Which of the following statements about glycolysis false?
a.
Glycolysis has steps involving oxidation-reduction reactions.
b.
The enzymes of glycolysis are located in the cytosol of the cell.
c.
Glycolysis can operate in the complete absence of O2.
d.
The end products of glycolysis are CO2 and H2O.
e.
Glycolysis makes ATP exclusively through substrate-level phosphorylation.
 

 5. 

Substrate-level phosphorylation accounts for approximately what percentage of the ATP formed during glycolysis?
a.
0%
b.
2%
c.
10%
d.
38%
e.
100%
 

 6. 

The free energy for the oxidation of glucose to CO2 and water is -686 kcal/mole and the free energy for the reduction of NAD+ to NADH•H+ is +53 kcal/mole. Why are only two molecules of NADH•H+ formed during glycolysis when it appears that as many as a dozen could be formed?
a.
Most of the free energy available from the oxidation of glucose is used in the production of ATP in glycolysis.
b.
Glycolysis is a very inefficient reaction, with much of the energy of glucose released as heat.
c.
Most of the free energy available from the oxidation of glucose remains in pyruvate, one of the products of glycolysis.
d.
There is no CO2 or water produced as products of glycolysis.
e.
Glycolysis consists of many enzymatic reactions, each of which extracts some energy from the glucose molecule.
 

 7. 

Starting with one molecule of glucose, the "net" products of glycolysis are
a.
2 NAD+, 2 H+, 2 pyruvate, 2 ATP, and 2 H2O.
b.
2 NADH•H+, 2 pyruvate, 2 ATP, and 2 H2O.
c.
2 FADH2, 2 pyruvate, 4 ATP, and 2 H2O.
d.
6 CO2, 6 H2O, 2 ATP, and 2 pyruvate.
e.
6 CO2, 6 H2O, 36 ATP, and 2 citrate.
 

 8. 

Which of the following intermediary metabolites enters the citric acid cycle and is formed, in part, by the removal of a carbon (CO2) from one molecule of pyruvate?
a.
lactate
b.
glyceraldehydes-3-phosphate
c.
oxaloacetate
d.
acetyl CoA
e.
citrate
 

 9. 

During cellular respiration, acetyl-CoA accumulates in which location?
a.
cytosol
b.
mitochondrial outer membrane
c.
mitochondrial inner membrane
d.
mitochondrial intermembrane space
e.
mitochondrial matrix
 
 
Refer to the figure below, showing the citric acid cycle, as a guide to answer the following questions.

chpt_09_files/i0110000.jpg
 

 10. 

How many molecules of carbon dioxide (CO2) would be produced by five turns of the citric acid cycle?
a.
2
b.
5
c.
10
d.
12
e.
60
 

 11. 

For each molecule of glucose that is metabolized by glycolysis and the citric acid cycle, what is the total number of NADH•H+ + FADH2 molecules produced?
a.
4
b.
5
c.
6
d.
10
e.
12
 

 12. 

During aerobic respiration, electrons travel downhill in which sequence?
a.
food chpt_09_files/i0140000.jpg citric acid cycle chpt_09_files/i0140001.jpg ATP chpt_09_files/i0140002.jpg NAD+
b.
food chpt_09_files/i0140003.jpg NADH•H+ chpt_09_files/i0140004.jpg electron transport chain chpt_09_files/i0140005.jpg oxygen
c.
glucose chpt_09_files/i0140006.jpg pyruvate chpt_09_files/i0140007.jpg ATP chpt_09_files/i0140008.jpg oxygen
d.
glucose chpt_09_files/i0140009.jpg ATP chpt_09_files/i0140010.jpg electron transport chain chpt_09_files/i0140011.jpg NADH•H+
e.
food chpt_09_files/i0140012.jpg glycolysis chpt_09_files/i0140013.jpg citric acid cycle chpt_09_files/i0140014.jpg NADH•H+ chpt_09_files/i0140015.jpg ATP
 

 13. 

During aerobic respiration, which of the following directly donates electrons to the electron transport chain at the lowest energy level?
a.
NAD+
b.
NADH•H+
c.
ATP
d.
ADP + Pi
e.
FADH2
 

 14. 

The primary role of oxygen in cellular respiration is to
a.
yield energy in the form of ATP as it is passed down the respiratory chain.
b.
act as an acceptor for electrons and hydrogen, forming water.
c.
combine with carbon, forming CO2.
d.
combine with lactate, forming pyruvate.
e.
catalyze the reactions of glycolysis.
 

 15. 

Which metabolic process is most closely associated with intracellular membranes?
a.
substrate-level phosphorylation
b.
oxidative phosphorylation
c.
glycolysis
d.
the citric acid cycle
e.
alcohol fermentation
 

 16. 

Energy released by the electron transport chain is used to pump H+ ions into which location?
a.
cytosol
b.
mitochondrial outer membrane
c.
mitochondrial inner membrane
d.
mitochondrial intermembrane space
e.
mitochondrial matrix
 

 17. 

How many molecules of carbon dioxide (CO2) would be released from the complete aerobic respiration of a molecule of sucrose (C12H22 O11), a disaccharide?
a.
2
b.
3
c.
6
d.
12
e.
38
 

 18. 

Which of the following produces the most ATP when glucose (C6H12O6) is completely oxidized to carbon dioxide (CO2) and water?
a.
glycolysis
b.
fermentation
c.
oxidation of pyruvate to acetyl-CoA
d.
citric acid cycle
e.
oxidative phosphorylation (chemiosmosis)
 

 19. 

Which of the following normally occurs whether or not oxygen (O2) is present?
a.
glycolysis
b.
fermentation
c.
oxidation of pyruvate to acetyl-CoA
d.
citric acid cycle
e.
oxidative phosphorylation (chemiosmosis)
 

 20. 

Muscle cells in oxygen deprivation convert pyruvate to ____, and in this step gain____.
a.
lactate; ATP
b.
alcohol; CO2
c.
alcohol; ATP
d.
ATP; NADH•H+
e.
lactate; NAD+
 

 21. 

Why is glycolysis considered to be one of the first metabolic pathways to have evolved?
a.
It produces much less ATP than does oxidative phosphorylation.
b.
It is found in the cytosol, does not involve oxygen, and is present in most organisms.
c.
It is found in prokaryotic cells but not in eukaryotic cells.
d.
It relies on chemiosmosis which is a metabolic mechanism present only in the first cells-prokaryotic cells.
e.
It requires the presence of membrane-enclosed cell organelles found only in eukaryotic cells.
 

 22. 

You have a friend who lost 7 kg (about 15 pounds) of fat on a "low carb" diet. How did the fat leave her body?
a.
It was released as CO2 and H2O.
b.
Chemical energy was converted to heat and then released.
c.
It was converted to ATP, which weighs much less than fat.
d.
It was broken down to amino acids and eliminated from the body.
e.
It was converted to urine and eliminated from the body.
 



 
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