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Life on Earth 4e
Chapter 7 Self Quiz
1. The main function of cellular respiration is to produce
a. O2.
b. glucose.
c. ATP.
d. NADH and FADH2.
e. All of the above.
2. You are playing a long tennis match and your muscles begin to switch to anaerobic
respiration. Which of the following is NOT a bad consequence?
a. Your cells convert NADH to NAD+.
b. Lactic acid is produced.
c. ATP production declines.
d. Oxygen debt increases.
e. All of these are problems.
3. What is the significance of the conversion of pyruvic acid (pyruvate) to lactic acid
during fermentation?
a. Pyruvic acid becomes available to enter matrix reactions.
b. The citric acid cycle is initiated.
c. NAD+ is regenerated for use in glycolysis.
d. Oxidation of pyruvic acid becomes possible.
e. ATP is produced.
4. How does one account for the bubbles that "tickle your nose" when one drinks a glass
of champagne?
a. Bubbles of CO2 are trapped due to the chemistry of aerobic respiration by yeast
b. Lactic acid fermentation accounts for the bubbles in a bottle of sparkling wine
such as champagne.
c. The champagne was bottled while the yeasts were still alive and fermenting, so
bubbles of CO2 were trapped.
d. The bubbles are simply air bubbles which resulted from the wine-making process.
e. The bubbles were formed by the yeast cells during glycolysis.
5. Which kind of metabolic poison would 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 capable of being
d. An agent that reacts with NADH and oxidizes it to NAD+.
e. An agent that inhibits the formation of acetyl coenzyme A.
Life on Earth 4e
6. The insecticide rotenone inhibits one of the steps of the electron transport system in
mitochondria. What is the immediate result?
a. Transport of pyruvate into the mitochondria will increase.
b. The cells will utilize oxygen more rapidly.
c. The rate of the Krebs cycle reactions will increase.
d. Electron transport will increase.
e. The rate of fermentation will increase.
7. When oxygen is present,
a. most cells utilize aerobic cellular respiration.
b. most animal cells will carry on fermentation and produce lactic acid.
c. most bacteria and yeasts carry on fermentation.
d. two ATP molecules are produced for each glucose molecule.
e. most animals will convert CO2 to glucose.
8. ATP can be used to drive metabolic reactions because
a. metabolic reactions release energy
b. the breakdown of ATP to ADP releases energy.
c. the breakdown of ATP to ADP requires energy.
d. when ATP is broken down to ADP, phosphate is released.
e. ADP possesses more free energy than ATP.
9. In yeast, if the electron transport system is shut down because of a lack of oxygen,
glycolysis will probably
a. shut down.
b. increase.
c. produce more ATP per molecule of glucose.
d. produce more NADH per molecule of glucose.
e. produce more acetyl coenzyme A.
10. As a runner pumps up a hill to the finish line of a race, her leg muscles are most
a. using cellular respiration to produce maximal ATP levels.
b. using more oxygen for maximal ATP production.
c. using lactic acid fermentation for ATP production.
d. both 1 and 2.
e. All of the above.