Question 1

At extremes of pH, an enzyme will lose its biologically active conformation.What term describes the state of the enzyme under these conditions?

Accepted Answer

A) denatured 
B) acidic 
C) basic 
D) buffered 
E) noncovalent 
A) denatured 
B) acidic 
C) basic 
D) buffered 
E) noncovalent

Question 2

An enzyme catalyzes the removal of an amino group from one substrate and its addition to another compound.To what class of enzymes does it belong?

Accepted Answer

A) kinase 
B) hydrolase 
C) transferase 
D) oxidoreductase 
E) lyase 
A) kinase 
B) hydrolase 
C) transferase 
D) oxidoreductase 
E) lyase

Question 3

The diagram below shows the energy pathway of an uncatalyzed reaction.How does the energy diagram change when an enzyme is used in the same reaction?

Accepted Answer

A) The energy of the products decreases. 
B) The energy of the reactants increases. 
C) The energy of the reactants decreases. 
D) The activation energy decreases. 
E) The energy of the reactants becomes equal to the energy of the products. 
A) The energy of the products decreases. 
B) The energy of the reactants increases. 
C) The energy of the reactants decreases. 
D) The activation energy decreases. 
E) The energy of the reactants becomes equal to the energy of the products.

Question 4

A second binding site on an allosteric enzyme has the ability to bind to a molecule that alters the shape of the active site.What is this second site called?

Accepted Answer

A) structural analog binding site 
B) effector binding site 
C) feedback binding site 
D) coenzyme binding site 
E) cofactor binding site 
A) structural analog binding site 
B) effector binding site 
C) feedback binding site 
D) coenzyme binding site 
E) cofactor binding site

Question 5

Which of the following will NOT destroy an enzyme by denaturation?

Accepted Answer

A) increase in temperature above 37oC (body temperature) 
B) decrease in temperature below 37oC 
C) significant increase in pH 
D) significant decrease in pH 
E) All of the choices will destroy an enzyme. 
A) increase in temperature above 37oC (body temperature) 
B) decrease in temperature below 37oC 
C) significant increase in pH 
D) significant decrease in pH 
E) All of the choices will destroy an enzyme.

Question 6

Which of the following describes the function of the enzyme cis-trans isomerase?

Accepted Answer

A) It breaks the double bond in an unsaturated fatty acid. 
B) It converts pentose sugars to hexose sugars. 
C) It converts between isomers on a disubstituted benzene ring. 
D) It converts between the boat and chair conformations of a cyclohexane. 
E) It breaks and re-forms a double bond to change the arrangement of the groups around a double bond. 
A) It breaks the double bond in an unsaturated fatty acid. 
B) It converts pentose sugars to hexose sugars. 
C) It converts between isomers on a disubstituted benzene ring. 
D) It converts between the boat and chair conformations of a cyclohexane. 
E) It breaks and re-forms a double bond to change the arrangement of the groups around a double bond.

Question 7

In feedback inhibition of an enzyme-catalyzed biosynthetic pathway, what frequently serves as the negative allosteric effector?

Accepted Answer

A) the starting material of the pathway 
B) acetylcholine 
C) oxygen 
D) the final product of the pathway 
E) temperature 
A) the starting material of the pathway 
B) acetylcholine 
C) oxygen 
D) the final product of the pathway 
E) temperature

Question 8

Which of the following is NOT a class of enzymes?

Accepted Answer

A) isomerases 
B) transferases 
C) carnases 
D) lyases 
E) ligases 
A) isomerases 
B) transferases 
C) carnases 
D) lyases 
E) ligases

Question 9

What term describes the pH at which an individual enzyme functions best?

Accepted Answer

A) isoelectric pH 
B) pH optimum 
C) physiological pH 
D) neutral pH 
E) zwitterion pH 
A) isoelectric pH 
B) pH optimum 
C) physiological pH 
D) neutral pH 
E) zwitterion pH

Question 10

The graph shows how the rate of an enzyme-catalyzed reaction depends on the variable x.Which of the following quantities could x most likely represent?

Accepted Answer

A) enzyme concentration 
B) pH 
C) energy 
D) substrate concentration 
E) progress of reaction 
A) enzyme concentration 
B) pH 
C) energy 
D) substrate concentration 
E) progress of reaction

Question 11

Arsenic is an example of an irreversible enzyme inhibitor.

Accepted Answer

A) True 
 B)False

Question 12

What is the function of a lyase enzyme?

Accepted Answer

A) to catalyze redox reactions 
B) to catalyze the transfer of a functional group from one molecule to another 
C) to catalyze hydrolysis reactions 
D) to catalyze the addition of a group to a double bond or the removal of a group to form a double bond 
E) to catalyze the formation or cleavage of a C-C, C-S, C-O, or C-N bond 
A) to catalyze redox reactions 
B) to catalyze the transfer of a functional group from one molecule to another 
C) to catalyze hydrolysis reactions 
D) to catalyze the addition of a group to a double bond or the removal of a group to form a double bond 
E) to catalyze the formation or cleavage of a C-C, C-S, C-O, or C-N bond

At extremes of pH, an enzyme will lose its biologically active conformation.What term describes the state of the enzyme under these conditions?

An enzyme catalyzes the removal of an amino group from one substrate and its addition to another compound.To what class of enzymes does it belong?

The diagram below shows the energy pathway of an uncatalyzed reaction.How does the energy diagram change when an enzyme is used in the same reaction?

A second binding site on an allosteric enzyme has the ability to bind to a molecule that alters the shape of the active site.What is this second site called?

Which of the following will NOT destroy an enzyme by denaturation?

Which of the following describes the function of the enzyme cis-trans isomerase?

In feedback inhibition of an enzyme-catalyzed biosynthetic pathway, what frequently serves as the negative allosteric effector?

Which of the following is NOT a class of enzymes?

What term describes the pH at which an individual enzyme functions best?

The graph shows how the rate of an enzyme-catalyzed reaction depends on the variable x.Which of the following quantities could x most likely represent?

Arsenic is an example of an irreversible enzyme inhibitor.

What is the function of a lyase enzyme?

Chemistry:methods and Measurement

The Structure of the Atom and the Periodic Table

Structure and Properties of Ionic and Covalent Compounds

Calculations, Chemical Changes, and the Chemical Equation

States of Matter- Gases, Liquids, and Solids

Solutions

Energy, Rate and Equilibrium

Acids and Bases

The Nucleus, Radioactivity, and Nuclear Medicine

An Introduction to Organic Chemistry- the Saturated Hydrocarbons

The Unsaturated Hydrocarbons- Alkenes, Alkynes, and Aromatics

Alcohols, Phenols, Thiols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Carboxylic Acid Derivatives

Amines and Amides

Carbohydrates

Lipids and Their Functions in Biochemical Systems

Protein Structure and Function

Introduction to Molecular Genetics

Carbohydrate Metabolism

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

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Exam 19: Enzymes

At extremes of pH, an enzyme will lose its biologically active conformation.What term describes the state of the enzyme under these conditions?

An enzyme catalyzes the removal of an amino group from one substrate and its addition to another compound.To what class of enzymes does it belong?

The diagram below shows the energy pathway of an uncatalyzed reaction.How does the energy diagram change when an enzyme is used in the same reaction?

A second binding site on an allosteric enzyme has the ability to bind to a molecule that alters the shape of the active site.What is this second site called?

Which of the following will NOT destroy an enzyme by denaturation?

Which of the following describes the function of the enzyme cis-trans isomerase?

In feedback inhibition of an enzyme-catalyzed biosynthetic pathway, what frequently serves as the negative allosteric effector?

Which of the following is NOT a class of enzymes?

What term describes the pH at which an individual enzyme functions best?

The graph shows how the rate of an enzyme-catalyzed reaction depends on the variable x.Which of the following quantities could x most likely represent?

Arsenic is an example of an irreversible enzyme inhibitor.

What is the function of a lyase enzyme?

Chemistry:methods and Measurement

The Structure of the Atom and the Periodic Table

Structure and Properties of Ionic and Covalent Compounds

Calculations, Chemical Changes, and the Chemical Equation

States of Matter- Gases, Liquids, and Solids

Solutions

Energy, Rate and Equilibrium

Acids and Bases

The Nucleus, Radioactivity, and Nuclear Medicine

An Introduction to Organic Chemistry- the Saturated Hydrocarbons

The Unsaturated Hydrocarbons- Alkenes, Alkynes, and Aromatics

Alcohols, Phenols, Thiols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Carboxylic Acid Derivatives

Amines and Amides

Carbohydrates

Lipids and Their Functions in Biochemical Systems

Protein Structure and Function

Introduction to Molecular Genetics

Carbohydrate Metabolism

Aerobic Respiration and Energy Production

Fatty Acid Metabolism

Filters