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Biochemistry Study Set 8

Chemistry

Quiz 7 :

Enzyme Mechanisms

Quiz 7 :

Enzyme Mechanisms

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Hexokinase catalyzes the phosphorylation of glucose to glucose 6-phosphate. Hexokinase belongs to which enzyme class?
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Multiple Choice
Answer:

Answer:

A

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Enzymes usually bind substrates with __________ affinity and specificity.
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Multiple Choice
Answer:

Answer:

A

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Binding of glucose to hexokinase causes a conformational change in the enzyme. This is an example of the __________ model of enzyme catalysis.
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Multiple Choice
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Answer:

C

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Which answer correctly pairs the enzyme class with the type of reaction catalyzed?
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The dihydrolipoyl transacetylase enzyme contains a lipoyl group. The lipoyl group is a(n)
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What is the rate enhancement as a result of the presence of an enzyme if the uncatalyzed rate of the reaction is 1.2 102 mmol/sec and the catalyzed rate is 2.4 104 mmol/sec?
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Below is a ribbon diagram of an enzyme. Four regions of the enzyme are indicated. Which is most likely the active site? img
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Which of the following is true of the induced-fit model of enzyme catalysis but NOT of the lock and key model of enzyme catalysis?
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The transition state of a reaction is
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Which of the following is a prosthetic group?
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A mutation of Lys229 in aldolase leads to a loss of enzyme activity. This is most likely because the
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An enzyme that requires the coenzyme nicotinamide adenine dinucleotide belongs to which enzyme class?
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Which of the following is a way that an enzyme can increase the rate of a reaction inside a cell?
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A reaction coordinate diagram comparing an uncatalyzed reaction with an enzyme-catalyzed reaction can directly illustrate that the enzyme , but will not directly illustrate that the enzyme _.
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Which of the following is true of a coenzyme but NOT true of a prosthetic group?
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Nitrite reductase contains two histidine amino acids that coordinate a Cu2+ ion. When the ion is present in the enzyme, the ion is a __________ and the enzyme is a _.
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An enzyme can increase the rate of a reaction inside a cell by the energy of the __________.
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Which of the following is a holoenzyme?
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Consider the reaction coordinate diagram shown below. X is ; Y is . img
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Enzyme active sites
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