Question 1

Yeast cells that have defective mitochondria incapable of respiration will be able to grow by catabolizing which of the following carbon sources for energy?

Accepted Answer

A)   glucose
B)   proteins
C)   fatty acids
D)   glucose, proteins, and fatty acids
E)   Such yeast cells will not be capable of catabolizing any food molecules, and will therefore die.F) C) and E)
G) D) and E) A

Question 2

Figure 9.1 illustrates some of the steps (reactions)  of glycolysis in their proper sequence. Each step is lettered. Use these letters to answer the questions.
  
Figure 9.1
-Which step in Figure 9.1 shows a split of one molecule into two smaller molecules?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   EF) C) and D)
G) A) and E)

Question 3

In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. First, however, the pyruvate (1)  loses a carbon, which is given off as a molecule of CO₂, (2)  is oxidized to form a two-carbon compound called acetate, and (3)  is bonded to coenzyme A.
-These three steps result in the formation of

Accepted Answer

A)   acetyl CoA, O₂, and ATP.
B)   acetyl CoA, FADH₂, and CO₂.
C)   acetyl CoA, FAD, H₂, and CO₂.
D)   acetyl CoA, NADH, H⁺, and CO₂.
E)   acetyl CoA, NAD⁺, ATP, and CO₂.F) All of the above
G) A) and B)

Question 4

The primary role of oxygen in cellular respiration is to

Accepted Answer

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.F) B) and D)
G) B) and C)

Question 5

High levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis. Citric acid binds to the enzyme at a different location from the active site. This is an example of

Accepted Answer

A)   competitive inhibition.
B)   allosteric regulation.
C)   the specificity of enzymes for their substrates.
D)   an enzyme requiring a cofactor.
E)   positive feedback regulation.F) A) and D)
G) All of the above

Question 6

Figure 9.2 The citric acid cycle.
-Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle (see Figure 9.2) ?

Accepted Answer

A)   1 ATP, 2 CO₂, 3 NADH, and 1 FADH₂
B)   2 ATP, 2 CO₂, 3 NADH, and 3 FADH₂
C)   3 ATP, 3 CO₂, 3 NADH, and 3 FADH₂
D)   3 ATP, 6 CO₂, 9 NADH, and 3 FADH₂
E)   38 ATP, 6 CO₂, 3 NADH, and 12 FADH₂F) All of the above
G) A) and C)

Question 7

Figure 9.1 illustrates some of the steps (reactions)  of glycolysis in their proper sequence. Each step is lettered. Use these letters to answer the questions.
  
Figure 9.1
-Which step in Figure 9.1 is a redox reaction?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   EF) D) and E)
G) C) and D) C

Question 8

Why are carbohydrates and fats considered high energy foods?

Accepted Answer

A)   They have a lot of oxygen atoms.
B)   They have no nitrogen in their makeup.
C)   They can have very long carbon skeletons.
D)   They have a lot of electrons associated with hydrogen.
E)   They are easily reduced.F) A) and B)
G) B) and D)

Question 9

An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism

Accepted Answer

A)   must use a molecule other than oxygen to accept electrons from the electron transport chain.
B)   is a normal eukaryotic organism.
C)   is photosynthetic.
D)   is an anaerobic organism.
E)   is a facultative anaerobe.F) C) and D)
G) A) and D)

Question 10

The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction

Accepted Answer

A)   gains electrons and gains potential energy.
B)   loses electrons and loses potential energy.
C)   gains electrons and loses potential energy.
D)   loses electrons and gains potential energy.
E)   neither gains nor loses electrons, but gains or loses potential energy.F) B) and D)
G) All of the above

Question 11

Figure 9.3
-Figure 9.3 shows the electron transport chain. Which of the following is the combination of substances that is initially added to the chain?

Accepted Answer

A)   oxygen, carbon dioxide, and water
B)   NAD⁺, FAD, and electrons
C)   NADH, FADH₂, and protons
D)   NADH, FADH₂, and O₂
E)   oxygen and protonsF) B) and E)
G) B) and D)

Question 12

In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP +  ᵢto ATP?

Accepted Answer

A)   energy released as electrons flow through the electron transport system
B)   energy released from substrate-level phosphorylation
C)   energy released from movement of protons through ATP synthase, against the electrochemical gradient
D)   energy released from movement of protons through ATP synthase, down the electrochemical gradient
E)   No external source of energy is required because the reaction is exergonic.F) B) and E)
G) None of the above

Question 13

Figure 9.3
-Which of the following most accurately describes what is happening along the electron transport chain in Figure 9.3?

Accepted Answer

A)   Chemiosmosis is coupled with electron transfer.
B)   Each electron carrier alternates between being reduced and being oxidized.
C)   ATP is generated at each step.
D)   Energy of the electrons increases at each step.
E)   Molecules in the chain give up some of their potential energy.F) A) and B)
G) B) and E) B

Question 14

During intense exercise, as skeletal muscle cells go into anaerobiosis, the human body will increase its catabolism of

Accepted Answer

A)   fats only.
B)   carbohydrates only.
C)   proteins only.
D)   fats, carbohydrates, and proteins.
E)   fats and proteins only.F) C) and D)
G) B) and C)

Question 15

Which of the following statements describes the results of this reaction?
C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

Accepted Answer

A)   C₆H₁₂O₆ is oxidized and O₂ is reduced.
B)   O₂ is oxidized and H₂O is reduced.
C)   CO₂ is reduced and O₂ is oxidized.
D)   C₆H₁₂O₆ is reduced and CO₂ is oxidized.
E)   O₂ is reduced and CO₂ is oxidized.F) A) and D)
G) A) and C)

Question 16

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

Accepted Answer

A)   ATP, CO₂, and ethanol (ethyl alcohol) .
B)   ATP, CO₂, and lactate.
C)   ATP, NADH, and pyruvate.
D)   ATP, pyruvate, and oxygen.
E)   ATP, pyruvate, and acetyl CoA.F) All of the above
G) D) and E)

Question 17

During aerobic respiration, electrons travel downhill in which sequence?

Accepted Answer

A)   food → citric acid cycle → ATP → NAD⁺
B)   food → NADH → electron transport chain → oxygen
C)   glucose → pyruvate → ATP → oxygen
D)   glucose → ATP → electron transport chain → NADH
E)   food → glycolysis → citric acid cycle → NADH → ATPF) B) and E)
G) A) and D)

Question 18

How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?

Accepted Answer

A)   two
B)   four
C)   six
D)   eight
E)   tenF) A) and B)
G) B) and E)

Question 19

When skeletal muscle cells undergo anaerobic respiration, they become fatigued and painful. This is now known to be caused by

Accepted Answer

A)   buildup of pyruvate.
B)   buildup of lactate.
C)   increase in sodium ions.
D)   increase in potassium ions.
E)   increase in ethanol.F) A) and E)
G) A) and D)

Question 20

Why is glycolysis described as having an investment phase and a payoff phase?

Accepted Answer

A)   It both splits molecules and assembles molecules.
B)   It attaches and detaches phosphate groups.
C)   It uses glucose and generates pyruvate.
D)   It shifts molecules from cytosol to mitochondrion.
E)   It uses stored ATP and then forms a net increase in ATP.F) A) and B)
G) A) and D)

Exam 9: Cellular Respiration and Fermentation

Yeast cells that have defective mitochondria incapable of respiration will be able to grow by catabolizing which of the following carbon sources for energy?

Correct Answer
verified
A

Figure 9.1 illustrates some of the steps (reactions) of glycolysis in their proper sequence. Each step is lettered. Use these letters to answer the questions. Figure 9.1 -Which step in Figure 9.1 shows a split of one molecule into two smaller molecules?

Correct Answer
verified

Correct Answer
verified

The primary role of oxygen in cellular respiration is to

Correct Answer
verified

High levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis. Citric acid binds to the enzyme at a different location from the active site. This is an example of

Correct Answer
verified

Figure 9.2 The citric acid cycle. -Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle (see Figure 9.2) ?

Correct Answer
verified

Figure 9.1 illustrates some of the steps (reactions) of glycolysis in their proper sequence. Each step is lettered. Use these letters to answer the questions. Figure 9.1 -Which step in Figure 9.1 is a redox reaction?

Correct Answer
verified
C

Why are carbohydrates and fats considered high energy foods?

Correct Answer
verified

An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism

Correct Answer
verified

The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction

Correct Answer
verified

Figure 9.3 -Figure 9.3 shows the electron transport chain. Which of the following is the combination of substances that is initially added to the chain?

Correct Answer
verified

In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + ᵢto ATP?

Correct Answer
verified

Figure 9.3 -Which of the following most accurately describes what is happening along the electron transport chain in Figure 9.3?

Correct Answer
verified
B

During intense exercise, as skeletal muscle cells go into anaerobiosis, the human body will increase its catabolism of

Correct Answer
verified

Which of the following statements describes the results of this reaction? C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

Correct Answer
verified

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

Correct Answer
verified

During aerobic respiration, electrons travel downhill in which sequence?

Correct Answer
verified

How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?

Correct Answer
verified

When skeletal muscle cells undergo anaerobic respiration, they become fatigued and painful. This is now known to be caused by

Correct Answer
verified

Why is glycolysis described as having an investment phase and a payoff phase?

Correct Answer
verified

Exam 9: Cellular Respiration and Fermentation

Yeast cells that have defective mitochondria incapable of respiration will be able to grow by catabolizing which of the following carbon sources for energy?

Correct AnswerverifiedA

Figure 9.1 illustrates some of the steps (reactions) of glycolysis in their proper sequence. Each step is lettered. Use these letters to answer the questions. Figure 9.1 -Which step in Figure 9.1 shows a split of one molecule into two smaller molecules?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The primary role of oxygen in cellular respiration is to

Correct AnswerverifiedShow Answer

High levels of citric acid inhibit the enzyme phosphofructokinase, a key enzyme in glycolysis. Citric acid binds to the enzyme at a different location from the active site. This is an example of

Correct AnswerverifiedShow Answer

Figure 9.2 The citric acid cycle. -Starting with citrate, which of the following combinations of products would result from three acetyl CoA molecules entering the citric acid cycle (see Figure 9.2) ?

Correct AnswerverifiedShow Answer

Figure 9.1 illustrates some of the steps (reactions) of glycolysis in their proper sequence. Each step is lettered. Use these letters to answer the questions. Figure 9.1 -Which step in Figure 9.1 is a redox reaction?

Correct AnswerverifiedC

Why are carbohydrates and fats considered high energy foods?

Correct AnswerverifiedShow Answer

An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism

Correct AnswerverifiedShow Answer

The molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction

Correct AnswerverifiedShow Answer

Figure 9.3 -Figure 9.3 shows the electron transport chain. Which of the following is the combination of substances that is initially added to the chain?

Correct AnswerverifiedShow Answer

In chemiosmotic phosphorylation, what is the most direct source of energy that is used to convert ADP + ᵢto ATP?

Correct AnswerverifiedShow Answer

Figure 9.3 -Which of the following most accurately describes what is happening along the electron transport chain in Figure 9.3?

Correct AnswerverifiedB

During intense exercise, as skeletal muscle cells go into anaerobiosis, the human body will increase its catabolism of

Correct AnswerverifiedShow Answer

Which of the following statements describes the results of this reaction? C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + Energy

Correct AnswerverifiedShow Answer

In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of

Correct AnswerverifiedShow Answer

During aerobic respiration, electrons travel downhill in which sequence?

Correct AnswerverifiedShow Answer

How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?

Correct AnswerverifiedShow Answer

When skeletal muscle cells undergo anaerobic respiration, they become fatigued and painful. This is now known to be caused by

Correct AnswerverifiedShow Answer

Why is glycolysis described as having an investment phase and a payoff phase?

Correct AnswerverifiedShow Answer

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A

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C

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B

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