Question 1

The toxicity of cyanide is due to its affinity for the

Accepted Answer

A)  "-SH groups of enzymes."
B)  "carboxyl groups of active sites."
C)  "iron atoms of cytochrome oxidase."
D)  "amino groups of hemoglobin."E) B) and D)
F) B) and C)

Question 2

Trypsin is an example of a proenzyme.

Accepted Answer

A) True 
 B)False

Question 3

Salivary amylase behaves as an enzyme only in the presence of chloride ions.Which of the following terms describes the function of the chloride ion?

Accepted Answer

A)  coenzyme
B)  zymogen
C)  activator
D)  active siteE) A) and B)
F) A) and C)

Question 4

Which of the following is a common function of many vitamins in the body?

Accepted Answer

A)  substrates
B)  apoenzymes
C)  coenzymes
D)  activatorsE) C) and D)
F) A) and B) C

Question 5

A neighbor comes to you having just moments ago ingested an unknown amount of antifreeze.You are miles from the nearest hospital.Which of the following is your best course of action after calling 911?

Accepted Answer

A)  To make their last moments as pleasant as possible.
B)  Give them enough whiskey to nearly get them intoxicated.
C)  Give them methanol to detoxify the antifreeze.
D)  Do nothing because antifreeze is not toxic to people.E) A) and D)
F) B) and D) B

Question 6

The optimum temperature for most enzymes is in the range of ____.

Accepted Answer

A)  25-40  °\degree° C
B)  0-25  °\degree° C
C)  50-70  °\degree° C
D)  40-60  °\degree° C E) A) and B)
F) All of the above

Question 7

____ would be considered as a common rate of chemical reaction measure per minute due to the presence of an enzyme.

Accepted Answer

A)  100
B)  1,000
C)  10,000
D)  100,000E) B) and C)
F) C) and D)

Question 8

The use of antibiotic creams and ointments should be restricted.Why?

Accepted Answer

A)  The excessive use will affect the flexibility of the skin in the immediate area.
B)  There is a possibility that the antibiotic will cause the skin to become dry.
C)  There is a possibility that antibiotic immune strains of bacteria will develop.
D)  There is more than one correct response.E) A) and D)
F) All of the above C

Question 9

Feedback inhibition is a type of allosteric regulation.

Accepted Answer

A) True 
 B)False

Question 10

The theory that proposes a somewhat flexible enzyme conformation is the

Accepted Answer

A)  lock-and-key theory.
B)  induced-fit theory.
C)  physically-fit theory.
D)  expanding-fit theory.E) B) and C)
F) A) and B)

Question 11

Enzyme synthesis is controlled by the genetic information of the individual.

Accepted Answer

A) True 
 B)False

Question 12

Enzymes,being proteins,are sensitive to the temperature and will be denatured by high temperatures.

Accepted Answer

A) True 
 B)False

Question 13

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) A) and C)
F) A) and B)

Question 14

____ 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) All of the above
F) None of the above

Question 15

Which of the following terms can be used correctly to fill the blank in the following equation? apoenzyme + ____  →\rightarrow→  active enzyme

Accepted Answer

A)  zymogen
B)  cofactor
C)  isozyme
D)  substrate E) None of the above
F) A) and B)

Question 16

Enzyme 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 B)
F) None of the above

Question 17

Enzymes increase the rates of only certain reactions involving certain substances.This general characteristic is called ____.

Accepted Answer

A)  selectivity
B)  enzyme regulation
C)  specificity
D)  catalytic efficiencyE) None of the above
F) A) and D)

Question 18

Consider the following reaction.  The enzyme that would be placed over the arrow is a _____ .

Accepted Answer

A)  ligase
B)  lyase
C)  hydrolase
D)  transferaseE) A) and C)
F) B) and C)

Question 19

A substance that when added to a reaction causes the production of more product is called a _____ .

Accepted Answer

A)  catalyst
B)  substrate
C)  inhibitor
D)  none of the choicesE) C) and D)
F) B) and C)

Question 20

An enzyme valuable in diagnosing heart attacks is _____ .

Accepted Answer

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

Exam 20: Enzymes

The toxicity of cyanide is due to its affinity for the

Correct AnswerverifiedShow Answer

Trypsin is an example of a proenzyme.

Correct AnswerverifiedShow Answer

Salivary amylase behaves as an enzyme only in the presence of chloride ions.Which of the following terms describes the function of the chloride ion?

Correct AnswerverifiedShow Answer

Which of the following is a common function of many vitamins in the body?

Correct AnswerverifiedC

A neighbor comes to you having just moments ago ingested an unknown amount of antifreeze.You are miles from the nearest hospital.Which of the following is your best course of action after calling 911?

Correct AnswerverifiedB

The optimum temperature for most enzymes is in the range of ____.

Correct AnswerverifiedShow Answer

____ would be considered as a common rate of chemical reaction measure per minute due to the presence of an enzyme.

Correct AnswerverifiedShow Answer

The use of antibiotic creams and ointments should be restricted.Why?

Correct AnswerverifiedC

Feedback inhibition is a type of allosteric regulation.

Correct AnswerverifiedShow Answer

The theory that proposes a somewhat flexible enzyme conformation is the

Correct AnswerverifiedShow Answer

Enzyme synthesis is controlled by the genetic information of the individual.

Correct AnswerverifiedShow Answer

Enzymes,being proteins,are sensitive to the temperature and will be denatured by high temperatures.

Correct AnswerverifiedShow Answer

Which disease is attributed to the lack of enzyme?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following terms can be used correctly to fill the blank in the following equation? apoenzyme + ____ →\rightarrow→ active enzyme

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Enzymes increase the rates of only certain reactions involving certain substances.This general characteristic is called ____.

Correct AnswerverifiedShow Answer

Consider the following reaction. The enzyme that would be placed over the arrow is a _____ .

Correct AnswerverifiedShow Answer

A substance that when added to a reaction causes the production of more product is called a _____ .

Correct AnswerverifiedShow Answer

An enzyme valuable in diagnosing heart attacks is _____ .

Correct AnswerverifiedShow Answer

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B

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C

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Which of the following terms can be used correctly to fill the blank in the following equation? apoenzyme + ____ $\rightarrow$ active enzyme

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