Question 1

The breakdown of H2CO3 into CO2 and H2O is catalyzed by an enzyme called carbonic anhydrase. Which of the following is a reactant in this reaction?

Accepted Answer

A)   H2CO3
B)   Carbonic anhydrase
C)   H2OD) All of the above
E) A) and C)

Question 2

Phosphorylation is carried out by a

Accepted Answer

A)   kinase, and it results in the negative feedback inhibition of an enzyme.
B)   kinase, and it may activate some enzymes and inhibit others.
C)   phosphatase, and it results in the negative feedback inhibition of an enzyme.
D)   phosphatase, and it may activate some enzymes and inhibit others.E) A) and D)
F) A) and C)

Question 3

Which statement accurately describes the effects of substrate and enzyme concentrations on reaction rate?

Accepted Answer

A)   An increase in either substrate or enzyme concentration will increase the reaction rate.
B)   An increase in either substrate or enzyme concentration will decrease the reaction rate.
C)   An increase in substrate concentration increases the reaction rate, but enzyme concentration has no effect.
D)   A decrease in substrate concentration or an increase in enzyme concentration increases the reaction rate.
E)   An increase in substrate concentration or a decrease in enzyme concentration will increase the reaction rate.F) None of the above
G) A) and C)

Question 4

Three molecules that are important energy storage locations in the body are

Accepted Answer

A)   DNA, tRNA, and rRNA.
B)   glucose, glucagon, and glycogen.
C)   ATP, glycogen, and triglyceride.
D)   ADP, DNA, and mRNA.
E)   glucagon, insulin, and protein.F) A) and B)
G) A) and E)

Question 5

Which enzyme system allows for regulation at a single site and also diminishes the chance that a needed substrate will diffuse away from a catalyst?

Accepted Answer

A)   Metabolic pathway
B)   Multienzyme complexC) A) and B)
D) undefined

Question 6

In the regulation of enzymes, negative feedback ensures that a lot of product can be made from only a little bit of substrate.

Accepted Answer

A) True 
 B)False

Question 7

The presence of an enzyme within a chemical system

Accepted Answer

A)   increases activation energy.
B)   decreases activation energy.
C)   increases potential energy.
D)   does not affect either activation energy or potential energy.E) B) and C)
F) None of the above

Question 8

At rest, muscle tissue prefers to use ________ molecules as sources of fuel.

Accepted Answer

A)   pyruvate
B)   fatty acid
C)   insulin
D)   protein
E)   simple carbohydrateF) A) and C)
G) B) and D)

Question 9

Structurally, enzymes are generally

Accepted Answer

A)   globular proteins.
B)   fibrous proteins.
C)   spherical carbohydrates.
D)   elongated carbohydrates.
E)   four-ring steroids.F) All of the above
G) A) and B)

Question 10

Which answer lists the steps of enzyme action in correct order?

Accepted Answer

A)   Formation of enzyme-substrate complex, induced fit, formation or breakage of chemical bonds, release of product
B)   Induced fit, formation of enzyme-substrate complex, formation or breakage of chemical bonds, release of product
C)   Formation or breakage of chemical bonds, induced fit, formation of enzyme-substrate complex, release of substrate
D)   Induced fit, formation or breakage of chemical bonds, formation of enzyme-substrate complex, release of productE) A) and B)
F) A) and C)

Question 11

The energy stored in a molecule's chemical bonds is a form of kinetic energy.

Accepted Answer

A) True 
 B)False

Question 12

A substance that binds to the active site of an enzyme and turns it off is called a(n) ________ inhibitor.

Accepted Answer

The answer of A substance that binds to the active...

Question 13

The form of kinetic energy that refers to the movement of electromagnetic waves is ________ energy.

Accepted Answer

The answer of The form of kinetic energy that refers...

Question 14

When a car burns gasoline, the majority of the gasoline's chemical energy is transformed to sound and heat.

Accepted Answer

A) True 
 B)False

Question 15

According to the second law of thermodynamics, when energy is transformed from one kind to another,

Accepted Answer

A)   some of it is converted to heat.
B)   some energy is destroyed.
C)   new energy is created.
D)   homeostasis is maintained.
E)   chemical bonds must be broken.F) A) and C)
G) None of the above

Question 16

One turn of the citric acid cycle results in the formation of

Accepted Answer

A)   1 ATP, 3 NADH, and 1 FADH2.
B)   2 pyruvates and 2 ATP.
C)   2 ATP, 2 NADH+, and 3 FADH.
D)   2 citrates, 4 ATP, and 3 FADH2.E) C) and D)
F) None of the above

Question 17

The term "activation energy" refers to the amount of energy

Accepted Answer

A)   released by an exergonic reaction.
B)   released by an endergonic reaction.
C)   released by a catabolic reaction.
D)   required to initiate any chemical reaction.
E)   required to initiate only catabolic reactions.F) A) and B)
G) C) and D)

Question 18

Stored energy is described as potential energy.

Accepted Answer

A) True 
 B)False

Question 19

The building of complex molecules from simpler ones is described as

Accepted Answer

A)   anabolism.
B)   catabolism.
C)   exergonic.
D)   irreversible.
E)   reversible.F) A) and B)
G) A) and C)

Question 20

Organic cofactors are referred to as ________.

Accepted Answer

The answer of Organic cofactors are referred to as ________....

Exam 3: Energy, Chemical Reactions, and Cellular Respiration

One turn of the citric acid cycle results in the formation of

Correct AnswerverifiedShow Answer

When a car burns gasoline, the majority of the gasoline's chemical energy is transformed to sound and heat.

Correct AnswerverifiedShow Answer

The form of kinetic energy that refers to the movement of electromagnetic waves is ________ energy.

Correct AnswerverifiedShow Answer

The breakdown of H2CO3 into CO2 and H2O is catalyzed by an enzyme called carbonic anhydrase. Which of the following is a reactant in this reaction?

Correct AnswerverifiedShow Answer

A substance that binds to the active site of an enzyme and turns it off is called a(n) ________ inhibitor.

Correct AnswerverifiedShow Answer

Structurally, enzymes are generally

Correct AnswerverifiedShow Answer

The building of complex molecules from simpler ones is described as

Correct AnswerverifiedShow Answer

Three molecules that are important energy storage locations in the body are

Correct AnswerverifiedShow Answer

In the regulation of enzymes, negative feedback ensures that a lot of product can be made from only a little bit of substrate.

Correct AnswerverifiedShow Answer

Which statement accurately describes the effects of substrate and enzyme concentrations on reaction rate?

Correct AnswerverifiedShow Answer

Stored energy is described as potential energy.

Correct AnswerverifiedShow Answer

The energy stored in a molecule's chemical bonds is a form of kinetic energy.

Correct AnswerverifiedShow Answer

Which answer lists the steps of enzyme action in correct order?

Correct AnswerverifiedShow Answer

Which enzyme system allows for regulation at a single site and also diminishes the chance that a needed substrate will diffuse away from a catalyst?

Correct AnswerverifiedShow Answer

Organic cofactors are referred to as ________.

Correct AnswerverifiedShow Answer

The presence of an enzyme within a chemical system

Correct AnswerverifiedShow Answer

Phosphorylation is carried out by a

Correct AnswerverifiedShow Answer

At rest, muscle tissue prefers to use ________ molecules as sources of fuel.

Correct AnswerverifiedShow Answer

The term "activation energy" refers to the amount of energy

Correct AnswerverifiedShow Answer

According to the second law of thermodynamics, when energy is transformed from one kind to another,

Correct AnswerverifiedShow Answer

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The breakdown of H₂CO₃ into CO₂ and H₂O is catalyzed by an enzyme called carbonic anhydrase. Which of the following is a reactant in this reaction?

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