Question 1

Which statement concerning an enzyme is true?

Accepted Answer

A) An enzyme increases the size of the equilibrium constant of the reaction it catalyzes. 
B) An enzyme decreases the size of the equilibrium constant of the reaction it catalyzes. 
C) An enzyme shifts the equilibrium so that more product is formed when equilibrium is reached. 
D) An enzyme increases the rate of a chemical reaction by lowering the activation energy. 
E) An enzyme slows down reactions that occur too rapidly to be effective in the body. 
A) An enzyme increases the size of the equilibrium constant of the reaction it catalyzes. 
B) An enzyme decreases the size of the equilibrium constant of the reaction it catalyzes. 
C) An enzyme shifts the equilibrium so that more product is formed when equilibrium is reached. 
D) An enzyme increases the rate of a chemical reaction by lowering the activation energy. 
E) An enzyme slows down reactions that occur too rapidly to be effective in the body.

Question 2

What is the first step in an enzyme-catalyzed reaction?

Accepted Answer

A) catalysis of enzyme 
B) dimerizing the substrate 
C) ionization of enzyme 
D) decrease of pH 
E) formation of an enzyme-substrate complex 
A) catalysis of enzyme 
B) dimerizing the substrate 
C) ionization of enzyme 
D) decrease of pH 
E) formation of an enzyme-substrate complex

Question 3

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 4

Which class of enzymes catalyzes reactions involving the formation of double bonds?

Accepted Answer

A) elastases 
B) oxidoreductases 
C) lyases 
D) catalases 
E) isomerases 
A) elastases 
B) oxidoreductases 
C) lyases 
D) catalases 
E) isomerases

Question 5

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 6

Which of the following is a medical use of enzymes?

Accepted Answer

A) enzyme assays to diagnose damage or disease to a particular organ or tissues 
B) injection of enzymes to counteract blood clots 
C) enzyme replacement therapy for missing or malfunctioning enzymes 
D) analytical reagents in the clinic laboratory 
E) All of the choices are correct. 
A) enzyme assays to diagnose damage or disease to a particular organ or tissues 
B) injection of enzymes to counteract blood clots 
C) enzyme replacement therapy for missing or malfunctioning enzymes 
D) analytical reagents in the clinic laboratory 
E) All of the choices are correct.

Question 7

The vitamin biotin is a component of a coenzyme.

Accepted Answer

A) True 
 B)False

Question 8

Elastase is a protease enzyme that cleaves peptide bonds on the carbonyl side of the amino acids glycine and alanine.What products result from treatment of a peptide with the primary structure shown below with elastase? Pro-Gly-Phe-Ala

Accepted Answer

A) the individual amino acids proline,glycine,phenylalanine,and alanine 
B) Pro-Gly,phenylalanine,and alanine 
C) proline,Gly-Phe,and alanine 
D) Pro-Gly,and Phe-Ala 
E) proline,glycine,and Phe-Ala 
A) the individual amino acids proline,glycine,phenylalanine,and alanine 
B) Pro-Gly,phenylalanine,and alanine 
C) proline,Gly-Phe,and alanine 
D) Pro-Gly,and Phe-Ala 
E) proline,glycine,and Phe-Ala

Question 9

A proenzyme is an inactive form of an enzyme.

Accepted Answer

A) True 
 B)False

Question 10

Some enzymes require an additional nonprotein prosthetic group in order to function.What is the nonprotein part of this combination called?

Accepted Answer

A) apoenzyme 
B) effector 
C) mineral 
D) cofactor 
E) vitamin 
A) apoenzyme 
B) effector 
C) mineral 
D) cofactor 
E) vitamin

Question 11

HIV protease inhibitors block the activity of enzymes responsible for which of the following?

Accepted Answer

A) viral replication 
B) digestion 
C) oxygen transport 
D) antibiotic activity 
E) pain production 
A) viral replication 
B) digestion 
C) oxygen transport 
D) antibiotic activity 
E) pain production

Question 12

What is the water-soluble vitamin from which NAD+ is made?

Accepted Answer

A) riboflavin (B2) 
B) niacin (B3) 
C) pyridoxine (B6) 
D) cyanocobalamine (B12) 
E) riboflavin (B2)and niacin (B3)are correct. 
A) riboflavin (B2) 
B) niacin (B3) 
C) pyridoxine (B6) 
D) cyanocobalamine (B12) 
E) riboflavin (B2)and niacin (B3)are correct.

Question 13

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 14

The protease enzyme chymotrypsin cleaves peptide bonds on the carbonyl side of aromatic amino acids.Which labeled bond in the peptide below would be cleaved by chymotrypsin?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Which statement concerning an enzyme is true?

What is the first step in an enzyme-catalyzed reaction?

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

Which class of enzymes catalyzes reactions involving the formation of double bonds?

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?

Which of the following is a medical use of enzymes?

The vitamin biotin is a component of a coenzyme.

Elastase is a protease enzyme that cleaves peptide bonds on the carbonyl side of the amino acids glycine and alanine.What products result from treatment of a peptide with the primary structure shown below with elastase? Pro-Gly-Phe-Ala

A proenzyme is an inactive form of an enzyme.

Some enzymes require an additional nonprotein prosthetic group in order to function.What is the nonprotein part of this combination called?

HIV protease inhibitors block the activity of enzymes responsible for which of the following?

What is the water-soluble vitamin from which NAD⁺ is made?

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?

The protease enzyme chymotrypsin cleaves peptide bonds on the carbonyl side of aromatic amino acids.Which labeled bond in the peptide below would be cleaved by chymotrypsin?

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 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

Exam 19: Enzymes

Which statement concerning an enzyme is true?

What is the first step in an enzyme-catalyzed reaction?

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

Which class of enzymes catalyzes reactions involving the formation of double bonds?

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?

Which of the following is a medical use of enzymes?

The vitamin biotin is a component of a coenzyme.

Elastase is a protease enzyme that cleaves peptide bonds on the carbonyl side of the amino acids glycine and alanine.What products result from treatment of a peptide with the primary structure shown below with elastase? Pro-Gly-Phe-Ala

A proenzyme is an inactive form of an enzyme.

Some enzymes require an additional nonprotein prosthetic group in order to function.What is the nonprotein part of this combination called?

HIV protease inhibitors block the activity of enzymes responsible for which of the following?

What is the water-soluble vitamin from which NAD+ is made?

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?

The protease enzyme chymotrypsin cleaves peptide bonds on the carbonyl side of aromatic amino acids.Which labeled bond in the peptide below would be cleaved by chymotrypsin?

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 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

What is the water-soluble vitamin from which NAD⁺ is made?