Question 1

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 C

Question 2

Which of the following compounds is not an enzyme?

Accepted Answer

A)   Cellulase
B)   fi- galactosidase
C)   Dehydrogenase
D)   Coenzyme A
E)   None of the above

Question 3

Beggiatoa bacteria get energy by oxidizing S2- to S6+. This means they take (1)  for their
(2)  .

Accepted Answer

A)   1- protons; 2- NAD+
B)   1- electrons; 2- electron transport chain
C)   1- glucose; 2- glycolysis
D)   1- electrons; 2- fermentation
E)   1- sulfur; 2- photophosphorylation

Question 4

Figure 5.3
 
-How would a noncompetitive inhibitor interfere with a reaction involving the enzyme in Figure 5.3?

Accepted Answer

A)   It would bind to a.
B)   It would bind to b.
C)   It would bind to c.
D)   It would bind to d.
E)   Can't tell.

Question 5

Figure 5.4
 
-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)   Competitive inhibition.
C)   Feedback inhibition.
D)   Allosteric inhibition.
E)   None of the above. B

Question 6

Assume you are working for a chemical company and you are responsible for growing a yeast culture that produces ethyl alcohol. The yeasts are growing well on the maltose medium but are not producing alcohol. The most likely explanation is

Accepted Answer

A)   Yeasts don't produce ethyl alcohol.
B)   O₂ is in the medium.
C)   Not enough protein is provided.
D)   The maltose is toxic.
E)   None of the above.

Question 7

How is ATP generated in the reaction in Figure 5.4?

Accepted Answer

A)   Fermentation
B)   Glycolysis
C)   Oxidative phosphorylation
D)   Substrate- level phosphorylation
E)   Photophosphorylation

Question 8

Figure 5.1
 
-Which compound is being reduced in the reaction in Figure 5.1?

Accepted Answer

A)   Isocitric acid and a- ketoglutaric acid
B)   NADH
C)   NADH and isocitric acid
D)   NAD+
E)   a- ketoglutaric acid and NAD+

Question 9

When oxygen is unavailable, Halobacterium produce ATP by

Accepted Answer

A)   Substrate- level phosphorylation.
B)   Fermentation.
C)   The Krebs cycle.
D)   Photophosphorylation.
E)   Oxidative phosphorylation.

Question 10

Aerobic respiration differs from anaerobic respiration in which of the following respects?

Accepted Answer

A)   The final electron acceptors are different.
B)   Anaerobic respiration is glycolysis.
C)   Aerobic respiration requires the electron transport chain.
D)   Aerobic respiration gets electrons from the Krebs cycle.
E)   Aerobic respiration produces more ATP.

Question 11

Figure 5.2
 
-What type of reaction is in Figure 5.2?

Accepted Answer

A)   Reduction
B)   Decarboxylation
C)   Dehydrogenation
D)   Oxidation
E)   Transamination

Question 12

According to the chemiosmotic mechanism, ATP is generated when

Accepted Answer

A)   Protons are moved across a membrane.
B)   Cells lyse in a hypotonic environment.
C)   Chlorophyll liberates an electron.
D)   A high- energy phosphate group is transferred from an intermediate metabolite to ADP.
E)   Electrons are transferred between carrier molecules.

Question 13

A strictly fermentative bacterium produces energy

Accepted Answer

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

Question 14

In green and purple bacteria, electrons to reduce CO2come from

Accepted Answer

A)   C6H12O6
B)   H2O
C)   Sunlight
D)   Chlorophyll
E)   CO2

Question 15

Uses CO₂ for carbon and H₂ for energy.

Accepted Answer

A)   Chemoheterotroph
B)   Photoheterotroph
C)   Photoautotroph
D)   Chemoautotroph
E)   None of the above

Question 16

Assume you are growing bacteria on a lipid medium that started at pH 7. The action of bacterial lipases should cause the pH of the medium to

Accepted Answer

A)   Increase.
B)   Decrease.
C)   Stay the same.

Question 17

Which of the following is not true about anaerobic respiration?

Accepted Answer

A)   It generates ATP.
B)   It involves the Krebs cycle.
C)   It involves glycolysis only.
D)   It requires cytochromes.
E)   It involves the reduction of nitrate.

Question 18

All the following are true about substrate- level phosphorylation except

Accepted Answer

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

Question 19

Figure 5.7
 
-The graph at the left of 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
E)   e B

Question 20

Which of the following is not true about photophosphorylation?

Accepted Answer

A)   The oxidation of carrier molecules releases energy.
B)   It occurs in photosynthesizing cells.
C)   Energy from oxidation reactions is used to generate ATP from ADP.
D)   Light liberates an electron from chlorophyll.
E)   It requires CO₂.

Exam 5: Microbial Metabolism

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

Correct AnswerverifiedC

Which of the following compounds is not an enzyme?

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Beggiatoa bacteria get energy by oxidizing S2- to S6+. This means they take (1) for their (2) .

Correct AnswerverifiedShow Answer

Figure 5.3 -How would a noncompetitive inhibitor interfere with a reaction involving the enzyme in Figure 5.3?

Correct AnswerverifiedShow Answer

Figure 5.4 -An enzyme, citrate synthase, in the Krebs cycle is inhibited by ATP; this is an example of all of the following except

Correct AnswerverifiedB

Assume you are working for a chemical company and you are responsible for growing a yeast culture that produces ethyl alcohol. The yeasts are growing well on the maltose medium but are not producing alcohol. The most likely explanation is

Correct AnswerverifiedShow Answer

How is ATP generated in the reaction in Figure 5.4?

Correct AnswerverifiedShow Answer

Figure 5.1 -Which compound is being reduced in the reaction in Figure 5.1?

Correct AnswerverifiedShow Answer

When oxygen is unavailable, Halobacterium produce ATP by

Correct AnswerverifiedShow Answer

Aerobic respiration differs from anaerobic respiration in which of the following respects?

Correct AnswerverifiedShow Answer

Figure 5.2 -What type of reaction is in Figure 5.2?

Correct AnswerverifiedShow Answer

According to the chemiosmotic mechanism, ATP is generated when

Correct AnswerverifiedShow Answer

A strictly fermentative bacterium produces energy

Correct AnswerverifiedShow Answer

In green and purple bacteria, electrons to reduce CO2come from

Correct AnswerverifiedShow Answer

Uses CO₂ for carbon and H₂ for energy.

Correct AnswerverifiedShow Answer

Assume you are growing bacteria on a lipid medium that started at pH 7. The action of bacterial lipases should cause the pH of the medium to

Correct AnswerverifiedShow Answer

Which of the following is not true about anaerobic respiration?

Correct AnswerverifiedShow Answer

All the following are true about substrate- level phosphorylation except

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

Which of the following is not true about photophosphorylation?

Correct AnswerverifiedShow Answer

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C

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Beggiatoa bacteria get energy by oxidizing S^2- to S⁶⁺. This means they take (1) for their (2) .

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B

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In green and purple bacteria, electrons to reduce CO₂come from

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B

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