Question 1

NADPH and NADH are coenzymes found in which class of enzymes?

Accepted Answer

A)   Dehydrogenases
B)   Ligases
C)   Hydrolases
D)   Transferases
E)   Both C and D are correct.F) A) and E)
G) None of the above

Question 2

List three enzymatic dyads.

Accepted Answer

The most commonly observed enz...

Question 3

What is a reaction intermediate?

Accepted Answer

A reaction intermediate is a s...

Question 4

What is meant by the term activation energy?

Accepted Answer

Activation energy is...

Question 5

An enzyme is a large complex molecule much of which is seemingly uninvolved in the enzyme's catalytic function. Would it be possible to eliminate excess polypeptide segments and still retain activity?

Accepted Answer

An enzyme's large size is required for c...

Question 6

Alcohol dehydrogenase is an example of which of the following classes of enzymes?

Accepted Answer

A)   Oxidoreductases
B)   Transferase
C)   Hydrolase
D)   Lyase
E)   IsomeraseF) A) and C)
G) A) and B)

Question 7

Freeze drying is a useful technique for isolating enzymes. If the pH is not carefully controlled, however, the enzyme frequently becomes denatured. Explain.

Accepted Answer

When ice forms, any solutes remaining in...

Question 8

Explain why enzyme kinetics measurement are made at the start of a reaction.

Accepted Answer

At the start of a reaction, the concentr...

Question 9

How does an enzyme attain catalytic perfection?

Accepted Answer

An enzyme achieves catalytic p...

Question 10

Which of the following amino acids is capable of acting as a general acid or general base at physiological pH?

Accepted Answer

A)   Glycine
B)   Histidine
C)   Tyrosine
D)   Tryptophan
E)   ProlineF) A) and B)
G) A) and C)

Question 11

Enzyme studies are best carried out in __________.

Accepted Answer

A)   dilute aqueous solution
B)   highly concentrated solutions of the enzyme
C)   highly concentrated solutions of the substrate
D)   the presence of an inert crowding agent
E)   the presence of a membraneF) C) and D)
G) All of the above

Question 12

What is meant by the term turnover number?

Accepted Answer

Turnover number is the number ...

Question 13

Is catalytic perfection a function of concentration?

Accepted Answer

Catalytic perfection occurs when an enzy...

Question 14

Describe negative feedback inhibition.

Accepted Answer

Negative feedback inhibition i...

Question 15

In competitive inhibition, increasing the concentration of substrate __________

Accepted Answer

A)   decreases the overall rate of the reaction
B)   increases the overall rate of the reaction
C)   is without effect
D)   the observed effect depends on the inhibitor
E)   competitive inhibitors do not affect the rate of the reactionF) C) and E)
G) B) and E)

Question 16

Which of the following is not a property of enzymes?

Accepted Answer

A)   Capable of being regulated
B)   Reaction rates high in comparison to uncatalyzed reaction
C)   Highly specific
D)   Side products of reactions are rare.
E)   All of the above are correct.F) A) and B)
G) B) and C)

Question 17

An enzyme without it cofactor is called __________.

Accepted Answer

A)   coenzyme
B)   apoenzyme
C)   holoenzyme
D)   noncatalytic
E)   isoenzymeF) A) and B)
G) All of the above

Question 18

The synthesis of enzymes in response to changing metabolic needs is referred to as __________.

Accepted Answer

A)   enzyme induction
B)   allosteric regulation
C)   negative feedback
D)   zymogen activation
E)   cooperative bindingF) A) and C)
G) C) and D)

Question 19

Enzymes act by __________.

Accepted Answer

A)   decreasing the energy of activation of a reaction
B)   increasing the energy of activation of a reaction
C)   raising the temperature of a reaction
D)   providing a surface to favorably orient the reactants
E)   Both A and D are correct.F) A) and E)
G) A) and D)

Question 20

Which of the following is a coenzyme?

Accepted Answer

A)   NADP+
B)   Zn++
C)   Cu++
D)   Insulin
E)   OxytocinF) A) and C)
G) C) and E)

Exam 6: Enzymes

List three enzymatic dyads.

Correct AnswerverifiedThe most commonly observed enz...View AnswerShow Answer

How does an enzyme attain catalytic perfection?

Correct AnswerverifiedAn enzyme achieves catalytic p...View AnswerShow Answer

Which of the following amino acids is capable of acting as a general acid or general base at physiological pH?

Correct AnswerverifiedShow Answer

The synthesis of enzymes in response to changing metabolic needs is referred to as __________.

Correct AnswerverifiedShow Answer

What is meant by the term turnover number?

Correct AnswerverifiedTurnover number is the number ...View AnswerShow Answer

Which of the following is a coenzyme?

Correct AnswerverifiedShow Answer

What is a reaction intermediate?

Correct AnswerverifiedA reaction intermediate is a s...View AnswerShow Answer

Enzymes act by __________.

Correct AnswerverifiedShow Answer

Describe negative feedback inhibition.

Correct AnswerverifiedNegative feedback inhibition i...View AnswerShow Answer

Explain why enzyme kinetics measurement are made at the start of a reaction.

Correct AnswerverifiedAt the start of a reaction, the concentr...View AnswerShow Answer

An enzyme is a large complex molecule much of which is seemingly uninvolved in the enzyme's catalytic function. Would it be possible to eliminate excess polypeptide segments and still retain activity?

Correct AnswerverifiedAn enzyme's large size is required for c...View AnswerShow Answer

Which of the following is not a property of enzymes?

Correct AnswerverifiedShow Answer

What is meant by the term activation energy?

Correct AnswerverifiedActivation energy is...View AnswerShow Answer

In competitive inhibition, increasing the concentration of substrate __________

Correct AnswerverifiedShow Answer

Freeze drying is a useful technique for isolating enzymes. If the pH is not carefully controlled, however, the enzyme frequently becomes denatured. Explain.

Correct AnswerverifiedWhen ice forms, any solutes remaining in...View AnswerShow Answer

Enzyme studies are best carried out in __________.

Correct AnswerverifiedShow Answer

Is catalytic perfection a function of concentration?

Correct AnswerverifiedCatalytic perfection occurs when an enzy...View AnswerShow Answer

NADPH and NADH are coenzymes found in which class of enzymes?

Correct AnswerverifiedShow Answer

Alcohol dehydrogenase is an example of which of the following classes of enzymes?

Correct AnswerverifiedShow Answer

An enzyme without it cofactor is called __________.

Correct AnswerverifiedShow Answer

Correct Answer
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The most commonly observed enz...
View Answer

Correct Answer
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An enzyme achieves catalytic p...
View Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Turnover number is the number ...
View Answer

Correct Answer
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Correct Answer
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A reaction intermediate is a s...
View Answer

Correct Answer
verified

Correct Answer
verified
Negative feedback inhibition i...
View Answer

Correct Answer
verified
At the start of a reaction, the concentr...
View Answer

Correct Answer
verified
An enzyme's large size is required for c...
View Answer

Correct Answer
verified

Correct Answer
verified
Activation energy is...
View Answer

Correct Answer
verified

Correct Answer
verified
When ice forms, any solutes remaining in...
View Answer

Correct Answer
verified

Correct Answer
verified
Catalytic perfection occurs when an enzy...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
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