Question 1

When a noncompetitive inhibitor molecule binds to an (active/allosteric) site on an enzyme, the shape of the active site changes so that the substrate molecules can no longer bind.

Accepted Answer

The answer of When a noncompetitive inhibitor molecule binds to...

Question 2

Which of the following is a fermentation product useful in the manufacture of cheese?

Accepted Answer

A)   acetic acid
B)   ammonia
C)   pyruvic acid
D)   lactic acid
E)   ethanolF) B) and C)
G) All of the above

Question 3

Which of the following statements concerning reduction reactions is FALSE?

Accepted Answer

A)   A molecule gains a hydrogen atom.
B)   An electron acceptor becomes more positively charged.
C)   An electron acceptor gains an electron.
D)   They are coupled with oxidation reactions.
E)   They frequently involve electron carrier molecules.F) D) and E)
G) B) and E)

Question 4

The pentose phosphate pathway generates all the necessary precursors for nucleotide biosynthesis.

Accepted Answer

A) True 
 B)False

Question 5

Light energy is used to fuel the assembly of carbon dioxide and water into carbohydrates in the process known as

Accepted Answer

A)   oxidation.
B)   fermentation.
C)   chemiosmosis.
D)   photosynthesis.
E)   gluconeogenesis.F) B) and C)
G) B) and E)

Question 6

Isomerases catalyze reactions in which

Accepted Answer

A)   biomolecules are broken down into their component parts.
B)   groups are transferred from one molecule to another.
C)   biomolecules are oxidized or reduced.
D)   atoms in biomolecules are rearranged.
E)   biomolecules are assembled from smaller molecules.F) A) and B)
G) D) and E)

Question 7

All of the following are forms of oxidation EXCEPT

Accepted Answer

A)   substrate level phosphorylation.
B)   gain of an oxygen atom and its electrons.
C)   loss of an electron.
D)   a dehydrogenation event.
E)   loss of hydrogen atom.F) B) and E)
G) None of the above

Question 8

Essential amino acids are amino acids that cannot be synthesized by an organism and so must be provided as nutrients.

Accepted Answer

A) True 
 B)False

Question 9

During reactions catalyzed by oxidoreductases an electron donor is

Accepted Answer

A)   reduced.
B)   degraded.
C)   synthesized.
D)   unaltered.
E)   oxidized.F) C) and D)
G) A) and D)

Question 10

During glycolysis, glucose is converted to (pyruvic/acetic/lactic) acid, a molecule that can be used in either fermentation or respiration pathways.

Accepted Answer

The answer of During glycolysis, glucose is converted to (pyruvic/acetic/lactic)...

Question 11

Reactions that are both catabolic and anabolic are amphibolic.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following is a non- protein carrier found in some electron transport chains?

Accepted Answer

A)   ribozymes
B)   metal- containing proteins
C)   flavoproteins
D)   ubiquinones
E)   cytochromesF) A) and B)
G) A) and C)

Question 13

Significant amounts of the NADPH required for the Calvin- Benson cycle are produced during the (cyclic/noncyclic) photophosphorylation reactions of photosynthesis.

Accepted Answer

The answer of Significant amounts of the NADPH required for...

Question 14

Which of the following produces NADPH?

Accepted Answer

A)   the Entner- Doudoroff pathway only
B)   the pentose phosphate pathway only
C)   the Embden- Meyerhof pathway only
D)   both the Embden- Meyerhof and Entner- Doudoroff pathways
E)   both the pentose phosphate and Entner- Doudoroff pathwaysF) A) and E)
G) All of the above

Question 15

Anaerobic respiration involves the use of molecules other than oxygen as the final electron (acceptor/donor) in an electron transport chain.

Accepted Answer

The answer of Anaerobic respiration involves the use of molecules...

Question 16

Which of the following is TRUE concerning the structure and function of enzymes?

Accepted Answer

A)   Enzymes can function at a wide range of pH.
B)   Competitive inhibition of an enzyme occurs when an inhibitor binds to an allosteric site on the enzyme.
C)   An apoenzyme is a combination of a cofactor bound to a holoenzyme.
D)   All enzymes bind cofactors necessary for their function.
E)   After an enzyme has catalyzed a reaction, it resumes its original shape and can interact with a new substrate molecule.F) C) and D)
G) A) and B)

Question 17

Another term for a protein catalyst is a(n) (enzyme/ribozyme).

Accepted Answer

The answer of Another term for a protein catalyst is...

Question 18

Laboratory fermentation tests often include a pH indicator because many bacteria produce (CO2/bases/acids) as they ferment carbohydrates.

Accepted Answer

The answer of Laboratory fermentation tests often include a pH...

Question 19

Identify the processes of glucose metabolism represented in Figure 5- 1.

Accepted Answer

A)   A = glycolysis, B = fermentation, C = Krebs cycle, D = electron transport chain.
B)   A = glycolysis, B = Krebs cycle, C = fermentation, D = electron transport chain
C)   A = fermentation, B = glycolysis, C = Krebs cycle, D = electron transport chain
D)   A = glycolysis, B = Krebs cycle, C = electron transport chain, D = fermentation.
E)   A = electron transport chain, B = Krebs cycle, C = glycolysis, D = fermentationF) All of the above
G) B) and E)

Question 20

Waste products such as sulfur are produced by (oxygenic/anoxygenic/aerobic) photosynthetic bacteria as they obtain electrons for noncyclic photophosphorylation.

Accepted Answer

The answer of Waste products such as sulfur are produced...

Exam 5: Microbial Metabolism

All of the following are forms of oxidation EXCEPT

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Which of the following is a non- protein carrier found in some electron transport chains?

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Which of the following statements concerning reduction reactions is FALSE?

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Which of the following is a fermentation product useful in the manufacture of cheese?

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Identify the processes of glucose metabolism represented in Figure 5- 1.

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Which of the following is TRUE concerning the structure and function of enzymes?

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During glycolysis, glucose is converted to (pyruvic/acetic/lactic) acid, a molecule that can be used in either fermentation or respiration pathways.

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Laboratory fermentation tests often include a pH indicator because many bacteria produce (CO2/bases/acids) as they ferment carbohydrates.

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Significant amounts of the NADPH required for the Calvin- Benson cycle are produced during the (cyclic/noncyclic) photophosphorylation reactions of photosynthesis.

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Which of the following produces NADPH?

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Reactions that are both catabolic and anabolic are amphibolic.

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Anaerobic respiration involves the use of molecules other than oxygen as the final electron (acceptor/donor) in an electron transport chain.

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Waste products such as sulfur are produced by (oxygenic/anoxygenic/aerobic) photosynthetic bacteria as they obtain electrons for noncyclic photophosphorylation.

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Another term for a protein catalyst is a(n) (enzyme/ribozyme).

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Essential amino acids are amino acids that cannot be synthesized by an organism and so must be provided as nutrients.

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Isomerases catalyze reactions in which

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Light energy is used to fuel the assembly of carbon dioxide and water into carbohydrates in the process known as

Correct AnswerverifiedShow Answer

The pentose phosphate pathway generates all the necessary precursors for nucleotide biosynthesis.

Correct AnswerverifiedShow Answer

When a noncompetitive inhibitor molecule binds to an (active/allosteric) site on an enzyme, the shape of the active site changes so that the substrate molecules can no longer bind.

Correct AnswerverifiedShow Answer

During reactions catalyzed by oxidoreductases an electron donor is

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