The International Unit (I.U.) for enzyme activity is that amount of enzyme which at 300 C will convert substrate to product at a rate of

A) 1 micromole/min. B) 1 micromole/sec. C) 1 millimole/min. D) 1 millimole/sec. E) 1 nmole/sec. A) 1 micromole/min. B) 1 micromole/sec. C) 1 millimole/min. D) 1 millimole/sec. E) 1 nmole/sec.

Exam 10: Enzymes: Classification, Kinetics, and Control

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In the presence of effector A an enzyme displays sigmoidal behavior when initial velocity is plotted against substrate concentration. With increasing concentrations of A the curve is displaced to the left (i.e., towards the ordinate). Effector A is thus

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Question 61

Allosteric control most often occurs through changes in Allosteric control most often occurs through changes in

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Question 62

Trypsin, chymotrypsin, elastase and thrombin are members of which of the following classes of enzymes?

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Question 63

During the course of a transaminase reaction the enzyme exists in two states; one containing bound pyridoxal phosphate and the other containing bound pyridoxamine phosphate. Kinetically a transaminase reaction

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Question 64

An enzyme which removes groups (other than hydrogens) and leaves double bonds is called

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Question 65

All of the following statements about allosteric enzymes are correct EXCEPT which one?

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Question 66

Which of the following is the most distinctive property of a competitive inhibitor?

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Question 67

An enzyme affects the rate of a chemical reaction by

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Question 68

Koshland has proposed the induced fit theory of enzyme action. This concept implies that:

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Question 69

The lock and key model of the active site:

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Question 70

A dehydrogenase would be placed in which enzyme category?

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Question 71

The International Unit (I.U.) for enzyme activity is that amount of enzyme which at 30⁰ C will convert substrate to product at a rate of

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Question 72

Use the Michaelis-Menten equation to calculate the initial velocity for an enzyme with Vmax = 3 micromole/min Km= 2 mM [S] = 4 mM

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Question 73

A Schiff base is formed by the interaction between

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Question 74

For an enzyme-substrate pair, a graph of reaction rate versus substrate concentration gives an S-shaped curve. From these data which of the following is the most likely conclusion?

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Question 75

In general, when the enzyme concentration is doubled the rate of an enzyme catalyzed reaction is

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Question 76

Which of the following is NOT CHARACTERISTIC of catalysts?

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Question 77

Which of the following is NOT a property of catalysts?

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Question 78

For an enzyme reaction where velocity (V) is plotted against substrate concentration (S), the portion of the curve where V is proportional to S is considered to be

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Question 79

A substance binds to an enzyme to decrease the apparent Km for the substrate. This substance will

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Question 80

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Exam 10: Enzymes: Classification, Kinetics, and Control

In the presence of effector A an enzyme displays sigmoidal behavior when initial velocity is plotted against substrate concentration. With increasing concentrations of A the curve is displaced to the left (i.e., towards the ordinate). Effector A is thus

Allosteric control most often occurs through changes in Allosteric control most often occurs through changes in

Trypsin, chymotrypsin, elastase and thrombin are members of which of the following classes of enzymes?

During the course of a transaminase reaction the enzyme exists in two states; one containing bound pyridoxal phosphate and the other containing bound pyridoxamine phosphate. Kinetically a transaminase reaction

An enzyme which removes groups (other than hydrogens) and leaves double bonds is called

All of the following statements about allosteric enzymes are correct EXCEPT which one?

Which of the following is the most distinctive property of a competitive inhibitor?

An enzyme affects the rate of a chemical reaction by

Koshland has proposed the induced fit theory of enzyme action. This concept implies that:

The lock and key model of the active site:

A dehydrogenase would be placed in which enzyme category?

The International Unit (I.U.) for enzyme activity is that amount of enzyme which at 300 C will convert substrate to product at a rate of

Use the Michaelis-Menten equation to calculate the initial velocity for an enzyme with Vmax = 3 micromole/min Km= 2 mM [S] = 4 mM

A Schiff base is formed by the interaction between

For an enzyme-substrate pair, a graph of reaction rate versus substrate concentration gives an S-shaped curve. From these data which of the following is the most likely conclusion?

In general, when the enzyme concentration is doubled the rate of an enzyme catalyzed reaction is

Which of the following is NOT CHARACTERISTIC of catalysts?

Which of the following is NOT a property of catalysts?

For an enzyme reaction where velocity (V) is plotted against substrate concentration (S), the portion of the curve where V is proportional to S is considered to be

A substance binds to an enzyme to decrease the apparent Km for the substrate. This substance will

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The International Unit (I.U.) for enzyme activity is that amount of enzyme which at 30⁰ C will convert substrate to product at a rate of