Question 1

The measure of how many product molecules can be produced by an enzyme per unit of time is referred to as that enzyme's

Accepted Answer

A)   coenzyme rate.
B)   affinity.
C)   catalytic rate.
D)   cofactor rate.
E)   specificity.F) C) and E)
G) A) and B)

Question 2

Enzymes are proteins. If the enzyme concentration is increased, the rate of activity of the enzyme will increase exponentially as long as there is substrate to bind. How does the body increase the enzyme concentration?

Accepted Answer

A)   through DNA replication
B)   by increasing the catalytic rate
C)   by increasing the body's core temperature
D)   through protein synthesis
E)   through feedback inhibitionF) B) and E)
G) C) and D)

Question 3

Metabolism of fatty acids that results in the accumulation of acetyl CoA can lead to a buildup of

Accepted Answer

A)   ketones.
B)   ATP.
C)   glycerol.
D)   amino acids.
E)   lactate.F) C) and D)
G) C) and E)

Question 4

How is glucose stored in muscle and liver cells?

Accepted Answer

A)   glycogen
B)   amino acids
C)   cellulose
D)   starch
E)   lipidsF) A) and B)
G) B) and C)

Question 5

Regulation of an enzyme through reversible binding of a modulator to a regulatory site on an enzyme is specifically called

Accepted Answer

A)   the lock -and -key model.
B)   pH regulation
C)   allosteric regulation.
D)   covalent regulation.
E)   the induced -fit model.F) C) and D)
G) A) and E)

Question 6

Under anaerobic conditions, which of the following is a final product of glucose catabolism?

Accepted Answer

A)   carbon dioxide
B)   lactic acid
C)   pyruvic acid
D)   acetyl coenzyme A
E)   waterF) A) and D)
G) A) and C)

Question 7

For each FADH2 that supplies electrons to the electron transport system, ATP(s)  is/are Synthesized. For each NADH + H+ that supplies electrons to the electron transport system, ________ATP(s)  is/are synthesized.

Accepted Answer

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

Question 8

Identify the following chemical reaction by its type: Protein + Phosphate -Protein -Phosphate.

Accepted Answer

A)   hydrolysis
B)   reduction
C)   oxidation
D)   condensation
E)   phosphorylationF) A) and B)
G) D) and E)

Question 9

Some enzymes require trace metals to function as cofactors. What do the trace metals do?

Accepted Answer

A)   Trace metals provide energy for the reaction.
B)   Trace metals covalently modulate the enzyme.
C)   Trace metals are necessary for the transfer of electrons between substrates.
D)   Trace metals are necessary for the transfer of uncharged chemical groups between substrates.
E)   Trace metals must be present in the enzyme in order for the enzyme to bind substrate.F) A) and B)
G) C) and E)

Question 10

The energy that is stored within an object for later use is referred to as_______energy.

Accepted Answer

A)   kinetic
B)   kinesthetic
C)   potential
D)   radiant
E)   thermalF) B) and C)
G) None of the above

Question 11

Lactate dehydrogenase is an enzyme in the mitochondrial matrix.

Accepted Answer

A) True 
 B)False  False

Question 12

In this model of enzyme activity, both substrate and product can bind to the active site.

Accepted Answer

A)   lock -and -key
B)   affinity
C)   law of mass action
D)   induced -fit
E)   enzyme -substrate -complexF) B) and C)
G) A) and E)

Question 13

Under anaerobic conditions, what is pyruvate converted to and where does this occur?

Accepted Answer

A)   acetyl coenzyme A in the mitochondria
B)   lactate in the mitochondria
C)   lactate in the cytosol
D)   acetyl coenzyme A in the cytosol
E)   fatty acid in the cytosolF) A) and C)
G) B) and D) C

Question 14

Identify the following chemical reaction by its type: ADP + Pi -ATP + H2O.

Accepted Answer

A)   condensation
B)   oxidation
C)   hydrolysis
D)   reduction
E)   phosphorylationF) A) and C)
G) B) and D)

Question 15

An energy -releasing reaction is referred to as an_______ 
reaction.

Accepted Answer

A)   activation
B)   equilibrium
C)   exchange
D)   exergonic
E)   endergonicF) A) and D)
G) None of the above

Question 16

The conversion of triglycerides to glycerol and fatty acids is called

Accepted Answer

A)   lipolysis.
B)   liposuction.
C)   gluconeogenesis.
D)   triglycerolysis.
E)   glycolysis.F) A) and D)
G) C) and D)

Question 17

Enzymes increase the activation energy of a reaction.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following molecules is NOT converted to glucose through the process of gluconeogenesis?

Accepted Answer

A)   fatty acids
B)   pyruvate
C)   glycerol
D)   amino acids
E)   lactateF) None of the above
G) A) and B)

Question 19

Proteins are broken down to amino acids by

Accepted Answer

A)   protein synthesis.
B)   proteolysis.
C)   gluconeogenesis.
D)   lipolysis.
E)   beta oxidation.F) A) and E)
G) C) and D)

Question 20

Which of the following statements about chemical equilibrium is FALSE?

Accepted Answer

A)   At equilibrium, the concentration of products equals the concentration of reactants.
B)   Adding an enzyme will not alter the equilibrium.
C)   Decreasing the amount of product will increase the production of product.
D)   At equilibrium, the rate of formation of products equals the rate of formation of reactants.
E)   Increasing the amount of reactant will increase the production of product.F) A) and E)
G) A) and D)

Exam 3: Cell Metabolism

The measure of how many product molecules can be produced by an enzyme per unit of time is referred to as that enzyme's

Correct AnswerverifiedShow Answer

Enzymes are proteins. If the enzyme concentration is increased, the rate of activity of the enzyme will increase exponentially as long as there is substrate to bind. How does the body increase the enzyme concentration?

Correct AnswerverifiedShow Answer

Metabolism of fatty acids that results in the accumulation of acetyl CoA can lead to a buildup of

Correct AnswerverifiedShow Answer

How is glucose stored in muscle and liver cells?

Correct AnswerverifiedShow Answer

Regulation of an enzyme through reversible binding of a modulator to a regulatory site on an enzyme is specifically called

Correct AnswerverifiedShow Answer

Under anaerobic conditions, which of the following is a final product of glucose catabolism?

Correct AnswerverifiedShow Answer

For each FADH2 that supplies electrons to the electron transport system, ATP(s) is/are Synthesized. For each NADH + H+ that supplies electrons to the electron transport system, ________ATP(s) is/are synthesized.

Correct AnswerverifiedD

Identify the following chemical reaction by its type: Protein + Phosphate -Protein -Phosphate.

Correct AnswerverifiedShow Answer

Some enzymes require trace metals to function as cofactors. What do the trace metals do?

Correct AnswerverifiedShow Answer

The energy that is stored within an object for later use is referred to as_______energy.

Correct AnswerverifiedShow Answer

Lactate dehydrogenase is an enzyme in the mitochondrial matrix.

Correct AnswerverifiedFalse

In this model of enzyme activity, both substrate and product can bind to the active site.

Correct AnswerverifiedShow Answer

Under anaerobic conditions, what is pyruvate converted to and where does this occur?

Correct AnswerverifiedC

Identify the following chemical reaction by its type: ADP + Pi -ATP + H2O.

Correct AnswerverifiedShow Answer

An energy -releasing reaction is referred to as an_______ reaction.

Correct AnswerverifiedShow Answer

The conversion of triglycerides to glycerol and fatty acids is called

Correct AnswerverifiedShow Answer

Enzymes increase the activation energy of a reaction.

Correct AnswerverifiedShow Answer

Which of the following molecules is NOT converted to glucose through the process of gluconeogenesis?

Correct AnswerverifiedShow Answer

Proteins are broken down to amino acids by

Correct AnswerverifiedShow Answer

Which of the following statements about chemical equilibrium is FALSE?

Correct AnswerverifiedShow Answer

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For each FADH₂that supplies electrons to the electron transport system, ATP(s) is/are Synthesized. For each NADH + H⁺that supplies electrons to the electron transport system, ________ATP(s) is/are synthesized.

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D

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False

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C

Identify the following chemical reaction by its type: ADP + Pi -ATP + H₂O.

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