Question 1

Fatty acids are oxidized in

Accepted Answer

A)   the Krebs cycle.
B)   the Entner-Doudoroff pathway.
C)   the pentose phosphate pathway.
D)   the electron transport chain.
E)   glycolysis.

Question 2

Figure 5.5  Which of the graphs in Figure 5.5 best illustrates the activity of an enzyme that is saturated with substrate?

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   e

Question 3

Which of the following is the best definition of oxidative phosphorylation?

Accepted Answer

A)   A proton gradient allows hydrogen ions to flow back into the cells through transmembrane protein channels, releasing energy that is used to generate ATP.
B)   Electrons are passed through a series of carriers to an organic compound.
C)   Electrons are passed through a series of carriers to O₂.
D)   ATP is directly transferred from a substrate to ADP.

Question 4

Which of the following statements about substrate-level phosphorylation is FALSE?

Accepted Answer

A)   It occurs in glycolysis.
B)   It involves the direct transfer of a high-energy phosphate group from an intermediate metabolic compound to ADP.
C)   No final electron acceptor is required.
D)   It occurs to a lesser degree in the Krebs cycle than in glycolysis.
E)   The oxidation of intermediate metabolic compounds releases energy that is used to generate ATP.

Question 5

A strictly fermentative bacterium produces energy

Accepted Answer

A)   only in the presence of oxygen.
B)   by aerobic respiration only.
C)   by fermentation or aerobic respiration.
D)   only in the absence of oxygen.
E)   by glycolysis only.

Question 6

Figure 5.7  The graph at the left in Figure 5.7 shows the reaction rate for an enzyme at its optimum temperature. Which graph shows enzyme activity at a higher temperature?

Accepted Answer

A)   a
B)   b
C)   c
D)   d

Question 7

Which of the following statements about anaerobic respiration is FALSE?

Accepted Answer

A)   It requires cytochromes.
B)   The complete Krebʹs cycle is utilized.
C)   It yields lower amounts of ATP when compared to aerobic respiration.
D)   It involves the reduction of an organic final electron acceptor.
E)   It generates ATP.

Question 8

Figure 5.8
 
-In Figure 5.8, where is ATP produced?

Accepted Answer

A)   a
B)   b
C)   c
D)   d
E)   e

Question 9

Figure 5.6  The rates of O₂ and glucose consumption by a bacterial culture are shown in Figure 5.6. Assume a bacterial culture was grown in a glucose medium without O₂. Then O₂ was added at the time marked X. The data indicate that

Accepted Answer

A)   these bacteria cannot grow anaerobically.
B)   these bacteria get more energy anaerobically.
C)   aerobic metabolism is more efficient than fermentation.
D)   these bacteria donʹt use O₂.

Question 10

Catabolic reactions are generally degradative and hydrolytic.

Accepted Answer

A) True 
 B)False

Question 11

In green and purple bacteria, electrons to reduce CO₂ can come from

Accepted Answer

A)   chlorophyll.
B)   H2S.
C)   CO₂.
D)   C6H12O6.
E)   H₂O.

Question 12

An enzyme, citrate synthase, in the Krebs cycle is inhibited by ATP. This is an example of all of the following EXCEPT

Accepted Answer

A)   noncompetitive inhibition.
B)   allosteric inhibition.
C)   competitive inhibition.
D)   feedback inhibition.

Question 13

Which of the following is the best definition of fermentation?

Accepted Answer

A)   the production of energy by oxidative-level phosphorylation
B)   the complete catabolism of glucose to CO₂ and H₂O
C)   the production of energy by both substrate and oxidative phosphorylation
D)   the partial oxidation of glucose with organic molecules serving as electron acceptors
E)   the partial reduction of glucose to pyruvic acid

Question 14

Which of the following statements regarding metabolism is FALSE?

Accepted Answer

A)   ATP is formed in catabolic reactions.
B)   Heat may be released in both anabolic and catabolic reactions.
C)   ADP is formed in anabolic reactions.
D)   Anabolic reactions are degradative.

Question 15

Figure 5.2  What type of reaction is in Figure 5.2?

Accepted Answer

A)   decarboxylation
B)   dehydrogenation
C)   oxidation
D)   reduction
E)   transamination

Question 16

Which of the following is NOT necessary for respiration?

Accepted Answer

A)   cytochromes
B)   a source of electrons
C)   quinones
D)   flavoproteins
E)   oxygen

Question 17

Figure 5.4  How is ATP generated in the reaction shown in Figure 5.4?

Accepted Answer

A)   glycolysis
B)   oxidative phosphorylation
C)   photophosphorylation
D)   fermentation
E)   substrate-level phosphorylation

Exam 5: Microbial Metabolism

A strictly fermentative bacterium produces energy

Correct Answer
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An enzyme, citrate synthase, in the Krebs cycle is inhibited by ATP. This is an example of all of the following EXCEPT

Correct Answer
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Figure 5.2 What type of reaction is in Figure 5.2?

Correct Answer
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Catabolic reactions are generally degradative and hydrolytic.

Correct Answer
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Figure 5.7 The graph at the left in Figure 5.7 shows the reaction rate for an enzyme at its optimum temperature. Which graph shows enzyme activity at a higher temperature?

Correct Answer
verified

Fatty acids are oxidized in

Correct Answer
verified

Which of the following is NOT necessary for respiration?

Correct Answer
verified

Which of the following is the best definition of oxidative phosphorylation?

Correct Answer
verified

Which of the following statements about substrate-level phosphorylation is FALSE?

Correct Answer
verified

Figure 5.6 The rates of O₂ and glucose consumption by a bacterial culture are shown in Figure 5.6. Assume a bacterial culture was grown in a glucose medium without O₂. Then O₂ was added at the time marked X. The data indicate that

Correct Answer
verified

Which of the following is the best definition of fermentation?

Correct Answer
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Figure 5.4 How is ATP generated in the reaction shown in Figure 5.4?

Correct Answer
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Which of the following statements about anaerobic respiration is FALSE?

Correct Answer
verified

In green and purple bacteria, electrons to reduce CO₂ can come from

Correct Answer
verified

Which of the following statements regarding metabolism is FALSE?

Correct Answer
verified

Figure 5.5 Which of the graphs in Figure 5.5 best illustrates the activity of an enzyme that is saturated with substrate?

Correct Answer
verified

Figure 5.8 -In Figure 5.8, where is ATP produced?

Correct Answer
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Exam 5: Microbial Metabolism

A strictly fermentative bacterium produces energy

Correct AnswerverifiedShow Answer

An enzyme, citrate synthase, in the Krebs cycle is inhibited by ATP. This is an example of all of the following EXCEPT

Correct AnswerverifiedShow Answer

Figure 5.2 What type of reaction is in Figure 5.2?

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Catabolic reactions are generally degradative and hydrolytic.

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Figure 5.7 The graph at the left in Figure 5.7 shows the reaction rate for an enzyme at its optimum temperature. Which graph shows enzyme activity at a higher temperature?

Correct AnswerverifiedShow Answer

Fatty acids are oxidized in

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Which of the following is NOT necessary for respiration?

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Which of the following is the best definition of oxidative phosphorylation?

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Which of the following statements about substrate-level phosphorylation is FALSE?

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Figure 5.6 The rates of O₂ and glucose consumption by a bacterial culture are shown in Figure 5.6. Assume a bacterial culture was grown in a glucose medium without O₂. Then O₂ was added at the time marked X. The data indicate that

Correct AnswerverifiedShow Answer

Which of the following is the best definition of fermentation?

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Figure 5.4 How is ATP generated in the reaction shown in Figure 5.4?

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Which of the following statements about anaerobic respiration is FALSE?

Correct AnswerverifiedShow Answer

In green and purple bacteria, electrons to reduce CO₂ can come from

Correct AnswerverifiedShow Answer

Which of the following statements regarding metabolism is FALSE?

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Figure 5.5 Which of the graphs in Figure 5.5 best illustrates the activity of an enzyme that is saturated with substrate?

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Figure 5.8 -In Figure 5.8, where is ATP produced?

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