Question 1

The lock-and-key theory is the explanation of how a coenzyme functions to modify the substrate which provides a specific product.

Accepted Answer

A) True 
 B)False

Question 2

Pepsin is named because it catalyzes a hydrolysis reaction,and the IEC uses "in" as the word ending to indicate hydrolysis reaction.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following enzyme properties is explained by the lock-and-key model?

Accepted Answer

A)   specificity
B)   high turnover rate
C)   high molecular weight
D)   susceptibility to denaturationE) None of the above
F) A) and B)

Question 4

While most enzymes increase the rate of a reaction by providing a new mechanism with a lower activation energy,there are several examples where they can also increase the activation energy and slow down or stop a reaction.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

An enzyme is operating at its optimum pH.If the pH were increased,how would the rate of the enzyme-catalyzed reaction change?

Accepted Answer

A)   increase
B)   decrease
C)   could increase or decrease
D)   would not changeE) B) and C)
F) All of the above

Question 7

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) B) and D)
F) A) and B)

Question 8

An irreversible inhibitor usually forms a covalent bond with the enzyme.

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

____ is an example of a cofactor required by an enzyme.

Accepted Answer

A)   Acetyl coenzyme A
B)   The ferrous (Fe2+) ion
C)   Lipoamide
D)   The sodium ionE) A) and B)
F) A) and C)

Question 11

The substrate for the digestive enzyme named sucrase is _____ .

Accepted Answer

A)   glucose
B)   fructose
C)   sucrose
D)   more than one response is correctE) B) and C)
F) C) and D)

Question 12

Isoenzymes vary from each other because they contain different isotopes of elements like carbon,nitrogen,oxygen and sulfur.

Accepted Answer

A) True 
 B)False

Question 13

The region of an enzyme where the substrate molecule fits is called the

Accepted Answer

A)   active site.
B)   substrate site.
C)   substrate bond.
D)   primary site.E) None of the above
F) B) and C)

Question 14

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

Accepted Answer

A) True 
 B)False  True

Question 15

Zymogen is another term for cofactor.

Accepted Answer

A) True 
 B)False

Question 16

An enzyme valuable in diagnosing heart attacks is _____ .

Accepted Answer

A)   LDH
B)   GPT
C)   lipase
D)   lysozymeE) C) and D)
F) A) and B)

Question 17

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

Accepted Answer

A) True 
 B)False  False

Question 18

Which of the following is true of a noncompetitive inhibitor?

Accepted Answer

A)   resembles the substrate
B)   binds at a site other than the active site
C)   can be reversed by adding more substrate
D)   more than one response is correctE) None of the above
F) All of the above B

Question 19

Which disease is attributed to the lack of enzyme?

Accepted Answer

A)   hypertension
B)   susceptibility to the cold viruses
C)   Tay-Sachs disease
D)   all of themE) B) and C)
F) A) and B)

Question 20

Chymotrypsin,an enzyme that cleaves peptide linkages,would be classified as a(n) _____ .

Accepted Answer

A)   hydrolase
B)   oxioreductase
C)   isomerase
D)   transferaseE) A) and C)
F) A) and D)

Exam 20: Enzymes

The lock-and-key theory is the explanation of how a coenzyme functions to modify the substrate which provides a specific product.

Correct AnswerverifiedShow Answer

Pepsin is named because it catalyzes a hydrolysis reaction,and the IEC uses "in" as the word ending to indicate hydrolysis reaction.

Correct AnswerverifiedShow Answer

Which of the following enzyme properties is explained by the lock-and-key model?

Correct AnswerverifiedShow Answer

While most enzymes increase the rate of a reaction by providing a new mechanism with a lower activation energy,there are several examples where they can also increase the activation energy and slow down or stop a reaction.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An enzyme is operating at its optimum pH.If the pH were increased,how would the rate of the enzyme-catalyzed reaction change?

Correct AnswerverifiedShow Answer

The conditions required for maximum enzyme function are called

Correct AnswerverifiedShow Answer

An irreversible inhibitor usually forms a covalent bond with the enzyme.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

____ is an example of a cofactor required by an enzyme.

Correct AnswerverifiedShow Answer

The substrate for the digestive enzyme named sucrase is _____ .

Correct AnswerverifiedShow Answer

Isoenzymes vary from each other because they contain different isotopes of elements like carbon,nitrogen,oxygen and sulfur.

Correct AnswerverifiedShow Answer

The region of an enzyme where the substrate molecule fits is called the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedTrue

Zymogen is another term for cofactor.

Correct AnswerverifiedShow Answer

An enzyme valuable in diagnosing heart attacks is _____ .

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFalse

Which of the following is true of a noncompetitive inhibitor?

Correct AnswerverifiedB

Which disease is attributed to the lack of enzyme?

Correct AnswerverifiedShow Answer

Chymotrypsin,an enzyme that cleaves peptide linkages,would be classified as a(n) _____ .

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
True

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
False

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified