Name:     ID: 
 
    Email: 

chap8quiz

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

 1. 
What is the term used for the metabolic pathway in which glucose (C6H12O6) is degraded to carbon dioxide (CO2) and water?
a.
cellular respiration
b.
glycolysis
c.
fermentation
d.
citric acid cycle
e.
oxidative phosphorylation
 

 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. 
When a molecule of NAD+ (nicotinamide adenine dinucleotide) gains a hydrogen atom (not a hydrogen ion) the molecule becomes
a.
hydrogenated.
b.
oxidized.
c.
reduced.
d.
redoxed.
e.
a reducing agent.
 

 4. 
Where does glycolysis takes place?
a.
mitochondrial matrix
b.
mitochondrial outer membrane
c.
mitochondrial inner membrane
d.
mitochondrial intermembrane space
e.
cytosol
 

 5. 
The ATP made during glycolysis is generated by
a.
substrate-level phosphorylation.
b.
electron transport.
c.
photophosphorylation.
d.
chemiosmosis.
e.
oxidation of NADH to NAD+.
 

 6. 
The oxygen consumed during cellular respiration is involved directly in which process or event?
a.
glycolysis
b.
accepting electrons at the end of the electron transport chain
c.
the citric acid cycle
d.
the oxidation of pyruvate to acetyl CoA
e.
the phosphorylation of ADP to form ATP
 

 7. 
Which process in eukaryotic cells will proceed normally whether oxygen (O2) is present or absent?
a.
electron transport
b.
glycolysis
c.
the citric acid cycle
d.
oxidative phosphorylation
e.
chemiosmosis
 

 8. 
Which kind of metabolic poison would most directly interfere with glycolysis?
a.
An agent that reacts with oxygen and depletes its concentration in the cell
b.
An agent that binds to pyruvate and inactivates it
c.
An agent that closely mimics the structure of glucose but is not metabolized
d.
An agent that reacts with NADH and oxidizes it to NAD+
e.
An agent that blocks the passage of electrons along the electron transport chain
 
 
Refer to the figure below, showing the citric acid cycle, as a guide to answer the following questions.

chap8quiz_files/i0100000.jpg
 

 9. 
Carbon dioxide (CO2) is released during which of the following stages of cellular respiration?
a.
glycolysis and the oxidation of pyruvate to acetyl CoA
b.
oxidation of pyruvate to acetyl CoA and the citric acid cycle
c.
the citric acid cycle and oxidative phosphorylation
d.
oxidative phosphorylation and fermentation
e.
fermentation and glycolysis
 

 10. 
During aerobic respiration, electrons travel downhill in which sequence?
a.
food chap8quiz_files/i0120000.jpg citric acid cycle chap8quiz_files/i0120001.jpg ATP chap8quiz_files/i0120002.jpg NAD+
b.
food chap8quiz_files/i0120003.jpg NADH chap8quiz_files/i0120004.jpg electron transport chain chap8quiz_files/i0120005.jpg oxygen
c.
glucose chap8quiz_files/i0120006.jpg pyruvate chap8quiz_files/i0120007.jpg ATP chap8quiz_files/i0120008.jpg oxygen
d.
glucose chap8quiz_files/i0120009.jpg ATP chap8quiz_files/i0120010.jpg electron transport chain chap8quiz_files/i0120011.jpg NADH
e.
food chap8quiz_files/i0120012.jpg glycolysis chap8quiz_files/i0120013.jpg citric acid cycle chap8quiz_files/i0120014.jpg NADH chap8quiz_files/i0120015.jpg ATP
 

 11. 
Where are the proteins of the electron transport chain located?
a.
cytosol
b.
mitochondrial outer membrane
c.
mitochondrial inner membrane
d.
mitochondrial intermembrane space
e.
mitochondrial matrix
 

 12. 
In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP?
a.
energy released as electrons flow through the electron transport system
b.
energy released from substrate-level phosphorylation
c.
energy released from ATP synthase pumping hydrogen ions against their concentration gradient
d.
energy released from movement of protons through ATP synthase
e.
No external source of energy is required because the reaction is exergonic.
 

 13. 
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
 

 14. 
During aerobic cellular respiration, a proton gradient in mitochondria is generated by ____ and used primarily for ____.
a.
the electron transport chain; ATP synthesis
b.
the electron transport chain; substrate-level phosphorylation
c.
glycolysis; production of H2O
d.
fermentation; NAD+ reduction
e.
diffusion of protons; ATP synthesis
 

 15. 
Where is ATP synthase located in the mitochondrion?
a.
cytosol
b.
electron transport chain
c.
outer membrane
d.
inner membrane
e.
mitochondrial matrix
 

 16. 
Which process could be compared to how rushing steam turns a water wheel?
a.
the citric acid cycle
b.
ATP synthase activity
c.
formation of NADH in glycolysis
d.
oxidative phosphorylation
e.
the electron transport system
 

 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. 
Each time a molecule of glucose (C6H12O6) is completely oxidized via aerobic respiration, how many oxygen molecules (O2). are required?
a.
1
b.
2
c.
6
d.
12
e.
38
 

 19. 
Approximately how many molecules of ATP are produced from the complete oxidation of two molecules of glucose (C6H12O6) in cellular respiration?
a.
2
b.
4
c.
15
d.
38
e.
76
 

 20. 
Approximately what percentage of the energy of glucose (C6H12O6) is transferred to storage in ATP as a result of the complete oxidation of glucose to CO2 and water in cellular respiration?
a.
2%
b.
4%
c.
10%
d.
25%
e.
40%
 

 21. 
Muscle cells in oxygen deprivation convert pyruvate to ____, and in this step gain____.
a.
lactate; ATP
b.
alcohol; CO2
c.
alcohol; ATP
d.
ATP; NADH2
e.
lactate; NAD+
 

 22. 
In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of
a.
ATP, CO2and ethanol (ethyl alcohol).
b.
ATP, CO2, and lactate.
c.
ATP, NADH, and pyruvate.
d.
ATP, pyruvate, and oxygen.
e.
ATP, pyruvate, and acetyl CoA.
 

 23. 
The function of both alcohol fermentation and lactic acid fermentation is to
a.
reduce NAD+ to NADH.
b.
reduce FAD+ to FADH2.
c.
oxidize NADH to NAD+.
d.
reduce FADH2 to FAD+.
e.
none of the above
 

 24. 
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.
 

 25. 
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.
 



 
Submit          Reset Help
Hosted by www.Geocities.ws

1