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 __________.

A) cofactor; apoenzyme B) cofactor; holoenzyme C) coenzyme; apoenzyme D) coenzyme; holoenzyme A) cofactor; apoenzyme B) cofactor; holoenzyme C) coenzyme; apoenzyme D) coenzyme; holoenzyme

Exam 7: Enzyme Mechanisms

What is the appropriate order of the following steps? A.Glutamine binding to uridylyltransferase B.Adenylation of glutamine synthetase C.Deuridylation of glutamine synthetase adenylyltransferase

(Multiple Choice)

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Question 81

If the rate constant for a reaction is determined to be equal to v / [Q][R],the reaction is the conversion of

(Multiple Choice)

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Question 82

In the formation of an ESI complex,__________ inhibition can result.

(Multiple Choice)

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Question 83

An enzyme is crystallized in preparation for X-ray crystallography.The crystal is then soaked in a solution of substrate and the crystal shatters.Propose a reason for this result.

(Essay)

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Question 84

What is Henry Eyring's transition state theory?

(Essay)

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Question 85

Hexokinase catalyzes the first step of glycolysis,which occurs in the cell cytoplasm.The protocol for an in vitro enzyme activity assay of hexokinase suggests that the assay is carried out at a pH of 7.4.Predict what may occur if the assay is carried out at a pH of 8.8 instead.Explain your reasoning.

(Essay)

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Question 86

A kinase adds a phosphate group to a target enzyme,altering the catalytic efficiency of the enzyme.This is an example of

(Multiple Choice)

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Question 87

Using words,define initial velocity (v₀)for an enzyme-catalyzed reaction.

(Essay)

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Question 88

Enzymes usually bind substrates with affinity and specificity.

(Multiple Choice)

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Question 89

Complete the following statement: The NH groups of Ser195 and Gly193 in chymotrypsin are able to stabilize the intermediate of the reaction by

(Short Answer)

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Question 90

If an enzyme carries out acid-base catalysis,which of the following amino acids could act as general acid?

(Multiple Choice)

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Question 91

The side chains of the amino acids that make up the catalytic triad of chymotrypsin contain all EXCEPT

(Multiple Choice)

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Question 92

Which type of reaction does not change the molecular formula of the product compared with that of the substrate?

(Multiple Choice)

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Question 93

A mutation results in the change of Ser to Asp in the substrate binding pocket of chymotrypsin.Most likely,the mutant enzyme will

(Multiple Choice)

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Question 94

Acetylcholinesterase is an important enzyme in the nervous system.Acetylcholinesterase activity is blocked by the nerve agent sarin gas,which forms a covalent bond with a Ser in the active site of the enzyme.Sarin gas is a(n)

(Multiple Choice)

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Question 95

Which pair correctly matches the coenzymes most often used to mediate the described redox reactions?

(Multiple Choice)

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Question 96

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 .

(Multiple Choice)

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Question 97

Which of the following is true of a coenzyme but NOT true of a prosthetic group?

(Multiple Choice)

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Question 98

Given the following parameters,calculate K_m.

(Short Answer)

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Question 99

An enzyme can increase the rate of a reaction inside a cell by the energy of the .

(Multiple Choice)

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Question 100

Showing 81 - 100 of 105

Exam 7: Enzyme Mechanisms

What is the appropriate order of the following steps? A.Glutamine binding to uridylyltransferase B.Adenylation of glutamine synthetase C.Deuridylation of glutamine synthetase adenylyltransferase

If the rate constant for a reaction is determined to be equal to v / [Q][R],the reaction is the conversion of

In the formation of an ESI complex,__________ inhibition can result.

An enzyme is crystallized in preparation for X-ray crystallography.The crystal is then soaked in a solution of substrate and the crystal shatters.Propose a reason for this result.

What is Henry Eyring's transition state theory?

A kinase adds a phosphate group to a target enzyme,altering the catalytic efficiency of the enzyme.This is an example of

Using words,define initial velocity (v0)for an enzyme-catalyzed reaction.

Enzymes usually bind substrates with __________ affinity and __________ specificity.

Complete the following statement: The NH groups of Ser195 and Gly193 in chymotrypsin are able to stabilize the intermediate of the reaction by

If an enzyme carries out acid-base catalysis,which of the following amino acids could act as general acid?

The side chains of the amino acids that make up the catalytic triad of chymotrypsin contain all EXCEPT

Which type of reaction does not change the molecular formula of the product compared with that of the substrate?

A mutation results in the change of Ser to Asp in the substrate binding pocket of chymotrypsin.Most likely,the mutant enzyme will

Acetylcholinesterase is an important enzyme in the nervous system.Acetylcholinesterase activity is blocked by the nerve agent sarin gas,which forms a covalent bond with a Ser in the active site of the enzyme.Sarin gas is a(n)

Which pair correctly matches the coenzymes most often used to mediate the described redox reactions?

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 __________.

Which of the following is true of a coenzyme but NOT true of a prosthetic group?

Given the following parameters,calculate Km.

An enzyme can increase the rate of a reaction inside a cell by __________ the energy of the __________.

Principles of Biochemistry

Physical Biochemistry: Energy Conversion,water,and Membranes

Nucleic Acid Structure and Function

Protein Structure

Methods in Protein Biochemistry

Protein Function

Cell Signaling Systems

Glycolysis: a Paradigm of Metabolic Regulation

The Citrate Cycle

Oxidative Phosphorylation

Photosynthesis

Carbohydrate Structure and Function

Carbohydrate Metabolism

Lipid Structure and Function

Lipid Metabolism

Amino Acid Metabolism

Nucleotide Metabolism

Metabolic Integration

Dna Replication, repair, and Recombination

Rna Synthesis, processing, and Gene Silencing

Protein Synthesis, posttranslational Modification, and Transport

Gene Regulation

Filters

Using words,define initial velocity (v₀)for an enzyme-catalyzed reaction.

Enzymes usually bind substrates with affinity and specificity.

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 .

Given the following parameters,calculate K_m.

An enzyme can increase the rate of a reaction inside a cell by the energy of the .