Question 1

The number of substrate molecules acted upon per minute by one molecule of enzyme is referred to as the

Accepted Answer

A)  optimum number.
B)  optimum rate.
C)  international unit.
D)  turnover number.E) None of the above
F) B) and C)

Question 2

Which modification of the reaction environment will increase the rate of reaction in which an enzyme participates?

Accepted Answer

A)  increase the temperature to the boiling point of water
B)  increase the concentration of the product to saturation
C)  increase the concentration of the enzyme
D)  increase the amount of water in the solutionE) A) and D)
F) None of the above

Question 3

The conditions required for maximum enzyme function are called

Accepted Answer

A)  room conditions.
B)  standard conditions.
C)  optimum conditions.
D)  low pressure,high temperature.E) A) and B)
F) A) and C)

Question 4

Ethylene glycol (antifreeze)poisoning can be avoided if methanol is administered shortly after ingesting the ethylene glycol.

Accepted Answer

A) True 
 B)False

Question 5

What is the general effect of increasing the substrate concentration in a reaction?

Accepted Answer

A)  The rate of the reaction will increase significantly.
B)  The rate of the reaction will increase eventually leveling off.
C)  The rate of the reaction will decrease significantly.
D)  The substrate concentration cannot be changed in any chemical reaction.E) A) and B)
F) A) and C)

Question 6

If a metal ion is required to activate an enzyme,it would be considered a ____.

Accepted Answer

A)  cofactor
B)  protoenzyme
C)  coenzyme
D)  zymogenE) All of the above
F) A) and D)

Question 7

Zymogen is another term for cofactor.

Accepted Answer

A) True 
 B)False

Question 8

Cofactors and enzymes form a tightly bound complex without which enzymes will not function.

Accepted Answer

A) True 
 B)False

Question 9

The EC name of an enzyme is alanine transaminase.This indicates that

Accepted Answer

A)  the substrate is alanine.
B)  the functional group is an amine.
C)  the type of reaction is a transfer.
D)  All of the above.E) C) and D)
F) A) and B)

Question 10

Which of the following is (are) active enzyme(s) ?

Accepted Answer

A)  pepsinogen
B)  proelastase
C)  trypsin
D)  all are active enzymesE) None of the above
F) C) and D)

Question 11

The cyanide ion is very toxic to humans because it binds with iron (Fe3+) in what enzyme to form a stable complex that stops cellular respiration.

Accepted Answer

A)  cytochrome reductase
B)  cytochrome kinase
C)  cytochrome oxidase
D)  elastaseE) B) and C)
F) None of the above

Question 12

Substrate concentration has what effect on the rate of an enzyme catalyzed reaction?

Accepted Answer

A)  increases
B)  decreases
C)  no effect
D)  increases until reaching a maximumE) A) and C)
F) None of the above

Question 13

Enzymes are proteins that speed up a chemical reaction; inhibitors slow down chemical reactions.

Accepted Answer

A) True 
 B)False

Question 14

A zymogen is correctly classified as a(n)

Accepted Answer

A)  organic cofactor for an enzyme.
B)  inorganic cofactor for an enzyme.
C)  coenzyme.
D)  inactive form of an enzyme.E) B) and D)
F) None of the above

Question 15

Inhibition is the irreversible process by which enzymes are rendered nonfunctional.

Accepted Answer

A) True 
 B)False

Question 16

Which of the following disorders results from a deficiency of the enzyme tyroinase?

Accepted Answer

A)  Albinism
B)  Galactosemia
C)  Phenylketonuria
D)  HomocystinuriaE) A) and D)
F) A) and C)

Question 17

Sulfanilamide prevents bacterial growth because it functions as a competitive inhibitor.

Accepted Answer

A) True 
 B)False

Question 18

Enzyme assays are reported in international units (IU).By the definition of an IU,the quantity of enzyme present is measured,not the chemical activity.

Accepted Answer

A) True 
 B)False

Question 19

How does a zymogen differ from an apoenzyme?

Accepted Answer

A)  An apoenzyme is deactivated by a cofactor.
B)  A zymogen is initially lacking an active site.
C)  A zymogen is activated by removing part of its structure.
D)  An apoenzyme is produced from a holoenzyme + coenzymeE) C) and D)
F) B) and D)

Question 20

The conversion of a zymogen into an enzyme usually involves another enzyme.

Accepted Answer

A) True 
 B)False

Exam 20: Enzymes

A zymogen is correctly classified as a(n)

Correct AnswerverifiedShow Answer

Which of the following disorders results from a deficiency of the enzyme tyroinase?

Correct AnswerverifiedShow Answer

Inhibition is the irreversible process by which enzymes are rendered nonfunctional.

Correct AnswerverifiedShow Answer

The cyanide ion is very toxic to humans because it binds with iron (Fe3+) in what enzyme to form a stable complex that stops cellular respiration.

Correct AnswerverifiedShow Answer

Enzyme assays are reported in international units (IU).By the definition of an IU,the quantity of enzyme present is measured,not the chemical activity.

Correct AnswerverifiedShow Answer

The conditions required for maximum enzyme function are called

Correct AnswerverifiedShow Answer

Substrate concentration has what effect on the rate of an enzyme catalyzed reaction?

Correct AnswerverifiedShow Answer

The number of substrate molecules acted upon per minute by one molecule of enzyme is referred to as the

Correct AnswerverifiedShow Answer

The EC name of an enzyme is alanine transaminase.This indicates that

Correct AnswerverifiedShow Answer

What is the general effect of increasing the substrate concentration in a reaction?

Correct AnswerverifiedShow Answer

The conversion of a zymogen into an enzyme usually involves another enzyme.

Correct AnswerverifiedShow Answer

Which of the following is (are) active enzyme(s) ?

Correct AnswerverifiedShow Answer

Ethylene glycol (antifreeze)poisoning can be avoided if methanol is administered shortly after ingesting the ethylene glycol.

Correct AnswerverifiedShow Answer

Sulfanilamide prevents bacterial growth because it functions as a competitive inhibitor.

Correct AnswerverifiedShow Answer

How does a zymogen differ from an apoenzyme?

Correct AnswerverifiedShow Answer

Cofactors and enzymes form a tightly bound complex without which enzymes will not function.

Correct AnswerverifiedShow Answer

If a metal ion is required to activate an enzyme,it would be considered a ____.

Correct AnswerverifiedShow Answer

Zymogen is another term for cofactor.

Correct AnswerverifiedShow Answer

Which modification of the reaction environment will increase the rate of reaction in which an enzyme participates?

Correct AnswerverifiedShow Answer

Enzymes are proteins that speed up a chemical reaction; inhibitors slow down chemical reactions.

Correct AnswerverifiedShow Answer

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The cyanide ion is very toxic to humans because it binds with iron (Fe³⁺) in what enzyme to form a stable complex that stops cellular respiration.

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