Question 1

Which of the following is true of a noncompetitive inhibitor?

Accepted Answer

A) resembles the substrate 
B) binds at a site other than the active site 
C) can be reversed by adding more substrate 
D) more than one response is correct 
A) resembles the substrate 
B) binds at a site other than the active site 
C) can be reversed by adding more substrate 
D) more than one response is correct

Question 2

Chymotrypsin,an enzyme that cleaves peptide linkages,would be classified as a(n)_____ .

Accepted Answer

A) hydrolase 
B) oxioreductase 
C) isomerase 
D) transferase 
A) hydrolase 
B) oxioreductase 
C) isomerase 
D) transferase

Question 3

Enzymes which are affected by the binding of modulators are called

Accepted Answer

A) induced enzymes. 
B) proenzymes. 
C) allosteric enzymes. 
D) controlled enzymes. 
A) induced enzymes. 
B) proenzymes. 
C) allosteric enzymes. 
D) controlled enzymes.

Question 4

The turnover number represents the enzyme concentration.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following terms is a general definition of an enzyme?

Accepted Answer

A) catalyst 
B) lipid 
C) carbohydrate 
D) activator 
A) catalyst 
B) lipid 
C) carbohydrate 
D) activator

Question 6

The substrate for the digestive enzyme named sucrase is _____ .

Accepted Answer

A) glucose 
B) fructose 
C) sucrose 
D) more than one response is correct 
A) glucose 
B) fructose 
C) sucrose 
D) more than one response is correct

Question 7

A type of enzyme regulation,where a product acts as an inhibitor molecule,is called ___ inhibition.

Accepted Answer

A) feedback 
B) end product 
C) competitive 
D) zymogenic 
A) feedback 
B) end product 
C) competitive 
D) zymogenic

Question 8

Which of the following accurately describes how an enzyme functions?

Accepted Answer

A) Reduces the enthalpy difference for the reactants and products. 
B) Allows for the exothermic reaction of materials that are usually endothermic. 
C) Changes the reaction mechanism,effectively reducing the activation energy. 
D) Shifts the equilibrium for the reaction. 
A) Reduces the enthalpy difference for the reactants and products. 
B) Allows for the exothermic reaction of materials that are usually endothermic. 
C) Changes the reaction mechanism,effectively reducing the activation energy. 
D) Shifts the equilibrium for the reaction.

Question 9

The synthesis of an enzyme in response to a cellular need is called

Accepted Answer

A) allosteric production. 
B) enzyme induction. 
C) feedback control. 
D) biofeedback. 
A) allosteric production. 
B) enzyme induction. 
C) feedback control. 
D) biofeedback.

Question 10

The measurement of various enzymes in the blood have been found to be useful for diagnosing pathological conditions.Which of the following enzymes is used to detect bone disease?

Accepted Answer

A) creatine kinase 
B) aspartate transaminase 
C) lactate dehydrogenase 
D) alkaline phosphatase 
A) creatine kinase 
B) aspartate transaminase 
C) lactate dehydrogenase 
D) alkaline phosphatase

Question 11

Which statement does not apply to the lock and key theory?

Accepted Answer

A) It explains the functioning of enzymes. 
B) It explains the need for a specific three dimensional structure found in proteins. 
C) It explains the reason why a particular enzyme is involved with one substrate. 
D) It explains why a substrate-enzyme complex is so difficult to separate. 
A) It explains the functioning of enzymes. 
B) It explains the need for a specific three dimensional structure found in proteins. 
C) It explains the reason why a particular enzyme is involved with one substrate. 
D) It explains why a substrate-enzyme complex is so difficult to separate.

Question 12

All enzymes catalyze specific reactions which makes it simpler to understand the chemistry of the living cell.

Accepted Answer

A) True 
 B)False

Question 13

Noncompetitive inhibitors often resemble the natural substrate in structure.

Accepted Answer

A) True 
 B)False

Question 14

In the diagram,which number would represent Vmax?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) either 2 or 3 
A) 1 
B) 2 
C) 3 
D) either 2 or 3

Question 15

Under saturation conditions,an enzyme-catalyzed reaction had a velocity V.Which of the following would increase the rate of the reaction?

Accepted Answer

A) a decrease in the substrate concentration 
B) an increase in the substrate concentration 
C) a decrease in the enzyme concentration 
D) an increase in the enzyme concentration 
A) a decrease in the substrate concentration 
B) an increase in the substrate concentration 
C) a decrease in the enzyme concentration 
D) an increase in the enzyme concentration

Question 16

Pepsin is named because it catalyzes a hydrolysis reaction,and the IEC uses "in" as the word ending to indicate hydrolysis reaction.

Accepted Answer

A) True 
 B)False

Question 17

An enzyme name of maltase indicates that the substrate is a carbohydrate.

Accepted Answer

A) True 
 B)False

Question 18

The lock-and-key theory is the explanation of how a coenzyme functions to modify the substrate which provides a specific product.

Accepted Answer

A) True 
 B)False

Question 19

An ACE inhibitor is a medication that is used to block the activity of angiotensin-converting enzymes,helping to reduce blood pressure.

Accepted Answer

A) True 
 B)False

Question 20

The following represents the results of an experiment on a metabolic enzyme.What is the optimum pH of this enzyme?

Accepted Answer

A) 3.0 
B) 5.5 
C) 6.5 
D) 9.5 
A) 3.0 
B) 5.5 
C) 6.5 
D) 9.5

Exam 20: Enzymes

Which of the following is true of a noncompetitive inhibitor?

Chymotrypsin,an enzyme that cleaves peptide linkages,would be classified as a(n)_____ .

Enzymes which are affected by the binding of modulators are called

The turnover number represents the enzyme concentration.

Which of the following terms is a general definition of an enzyme?

The substrate for the digestive enzyme named sucrase is _____ .

A type of enzyme regulation,where a product acts as an inhibitor molecule,is called ___ inhibition.

Which of the following accurately describes how an enzyme functions?

The synthesis of an enzyme in response to a cellular need is called

The measurement of various enzymes in the blood have been found to be useful for diagnosing pathological conditions.Which of the following enzymes is used to detect bone disease?

Which statement does not apply to the lock and key theory?

All enzymes catalyze specific reactions which makes it simpler to understand the chemistry of the living cell.

Noncompetitive inhibitors often resemble the natural substrate in structure.

In the diagram,which number would represent Vmax?

Under saturation conditions,an enzyme-catalyzed reaction had a velocity V.Which of the following would increase the rate of the reaction?

Pepsin is named because it catalyzes a hydrolysis reaction,and the IEC uses "in" as the word ending to indicate hydrolysis reaction.

An enzyme name of maltase indicates that the substrate is a carbohydrate.

The lock-and-key theory is the explanation of how a coenzyme functions to modify the substrate which provides a specific product.

An ACE inhibitor is a medication that is used to block the activity of angiotensin-converting enzymes,helping to reduce blood pressure.

The following represents the results of an experiment on a metabolic enzyme.What is the optimum pH of this enzyme?

Matter, measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

The States of Matter

Solutions and Colloids

Reaction Rates and Equilibrium

Acids, bases, and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

In the diagram,which number would represent V_max?