Question 1

Which of the following choices lists the order of stages of cellular respiration in proper order?

Accepted Answer

A)   Glycolysis, intermediate stage, citric acid cycle, and the electron transport system
B)   Citric acid cycle, glycolysis, intermediate stage, and the electron transport system
C)   Glycolysis, citric acid cycle, intermediate stage, and the electron transport system
D)   Glycolysis, intermediate stage, electron transport system, and the citric acid cycle
E)   Citric acid cycle, electron transport chain, intermediate stage, and glycolysisF) D) and E)
G) B) and D)

Question 2

The first law of thermodynamics states that once energy is consumed, it can no longer be converted to any other form of energy.

Accepted Answer

A) True 
 B)False

Question 3

Cold temperatures (below 36°C) denature proteins, which is why biochemistry labs never freeze enzymes.

Accepted Answer

A) True 
 B)False

Question 4

A reaction with a very high activation energy should have a very high reaction rate.

Accepted Answer

A) True 
 B)False

Question 5

A protein kinase is an enzyme that adds a phosphate to its substrate.

Accepted Answer

A) True 
 B)False

Question 6

A group of enzymes that are physically attached to one another is referred to as a(n)

Accepted Answer

A)   allosteric pathway.
B)   metabolic pathway.
C)   multienzyme complex.
D)   phosphate complex.E) None of the above
F) B) and D)

Question 7

A fever of 101°F causes most enzymes in the human body

Accepted Answer

A)   to denature.
B)   to become more rigid.
C)   to be more flexible and efficient.
D)   to saturate.E) A) and D)
F) All of the above

Question 8

In the final step of enzymatic catalysis,

Accepted Answer

A)   the substrate is released and the enzyme is inactivated.
B)   the product is completed and the enzyme is inactivated.
C)   the products are released and the enzyme is free to bind other substrates.
D)   the enzyme and substrate form chemical bonds with each other resulting in a new product.
E)   equilibrium is obtained so that the enzyme does not catalyze further reactions.F) B) and E)
G) C) and E)

Question 9

The enzyme-substrate complex is

Accepted Answer

A)   another name for the active site.
B)   the reactants whose chemical reaction the enzyme catalyzes.
C)   the chemical structure formed when the substrate binds to the active site.
D)   a pocket on the substrate that the enzyme recognizes.E) None of the above
F) A) and B)

Question 10

During electron transport, how many ATP can be generated from the energy contributed by a molecule of NADH?

Accepted Answer

A)   1
B)   2
C)   3
D)   30
E)   36F) A) and C)
G) A) and E)

Question 11

Which stage of cellular respiration is catalyzed by pyruvate dehydrogenase?

Accepted Answer

A)   Electron transport system
B)   Intermediate stage
C)   Citric acid cycle
D)   Glycolysis
E)   Fermentation to lactateF) None of the above
G) B) and D)

Question 12

The enzyme DNA polymerase is synthesized

Accepted Answer

A)   at a ribosome, and it remains within the cell.
B)   at the rough endoplasmic reticulum, and it is secreted from the cell.
C)   at the Golgi apparatus, and it is embedded in the cell membrane.
D)   in the nucleus, and it is converted to RNA for export outside the cell.E) C) and D)
F) B) and C)

Question 13

Decarboxylation occurs during the intermediate stage of aerobic cellular respiration.

Accepted Answer

A) True 
 B)False

Question 14

The intermediate stage of cellular respiration

Accepted Answer

A)   produces ATP and occurs in the cytosol.
B)   produces carbon dioxide and occurs in the mitochondria.
C)   requires Coenzyme A and occurs in the cytosol.
D)   produces pyruvate and occurs in the mitochondria.E) A) and D)
F) None of the above

Question 15

Enzymes are biological catalysts that are crucial for normal human metabolism.

Accepted Answer

A) True 
 B)False

Question 16

Saturation occurs when

Accepted Answer

A)   there is so much enzyme present that the reaction rate decreases if more is added.
B)   all enzymes are busy and further increases in substrate concentration will not increase reaction rate.
C)   enzymes become fatigued and can no longer catalyze changes in the substrate.
D)   intramolecular interactions are disrupted in the enzyme, decreasing its efficiency and decreasing reaction rate.
E)   the substrate is denatured and the enzyme cannot catalyze any changes in its structure.F) B) and E)
G) C) and D)

Question 17

In performing its enzymatic function, carbonic anhydrase

Accepted Answer

A)   requires the inorganic coenzyme zinc.
B)   requires the organic coenzyme carbon dioxide.
C)   is facilitated by the inorganic coenzyme NAD+.
D)   is facilitated by the organic coenzyme zinc.
E)   requires the inorganic coenzyme NADPH.F) B) and E)
G) D) and E)

Question 18

During cellular respiration, decarboxylation occurs when

Accepted Answer

A)   a carbon atom is removed from glucose.
B)   a carbon dioxide molecule is removed from the cytosol.
C)   a carboxyl group is released from pyruvate.
D)   a carbon atom is removed from and an oxygen atom is added to fructose.
E)   all carbon and oxygen atoms are released from a high-energy molecule.F) B) and C)
G) A) and D)

Question 19

Imagine that you discovered an enzyme in the human stomach that turned the substrate "ABC" into the product "XYZ". Name this enzyme (using the standard convention) and describe its chemical characteristics. Under what conditions would it be an effective catalyst? How might its activity be regulated?

Accepted Answer

The enzyme "ABCase" would work best at o...

Question 20

Which one of the following choices includes three descriptions that are consistent with each other (that is, that describe the same type of chemical reaction) ?

Accepted Answer

A)   Anabolic, dehydration, endergonic
B)   Exchange, hydrolysis, endergonic
C)   Catabolic, dehydration, irreversible
D)   Metabolic, synthesis, exergonic
E)   Anabolic, catabolic, dehydrationF) B) and C)
G) A) and E)

Exam 3: Energy, Chemical Reactions, and Cellular Respiration

Saturation occurs when

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Enzymes are biological catalysts that are crucial for normal human metabolism.

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During cellular respiration, decarboxylation occurs when

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The enzyme DNA polymerase is synthesized

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Which stage of cellular respiration is catalyzed by pyruvate dehydrogenase?

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Cold temperatures (below 36°C) denature proteins, which is why biochemistry labs never freeze enzymes.

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A reaction with a very high activation energy should have a very high reaction rate.

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Correct AnswerverifiedThe enzyme "ABCase" would work best at o...View AnswerShow Answer

A group of enzymes that are physically attached to one another is referred to as a(n)

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In performing its enzymatic function, carbonic anhydrase

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The enzyme-substrate complex is

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During electron transport, how many ATP can be generated from the energy contributed by a molecule of NADH?

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A protein kinase is an enzyme that adds a phosphate to its substrate.

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Which one of the following choices includes three descriptions that are consistent with each other (that is, that describe the same type of chemical reaction) ?

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The first law of thermodynamics states that once energy is consumed, it can no longer be converted to any other form of energy.

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A fever of 101°F causes most enzymes in the human body

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In the final step of enzymatic catalysis,

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Decarboxylation occurs during the intermediate stage of aerobic cellular respiration.

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The intermediate stage of cellular respiration

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Which of the following choices lists the order of stages of cellular respiration in proper order?

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The enzyme "ABCase" would work best at o...
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