Question 1

Which of the following is a common function of many vitamins in the body?

Accepted Answer

A) substrates 
B) apoenzymes 
C) coenzymes 
D) activators 
A) substrates 
B) apoenzymes 
C) coenzymes 
D) activators

Question 2

Which modification of the reaction environment will increase the rate of reaction in which an enzyme participates?

Accepted Answer

A) increase the temperature to the boiling point of water 
B) increase the concentration of the product to saturation 
C) increase the concentration of the enzyme 
D) increase the amount of water in the solution 
A) increase the temperature to the boiling point of water 
B) increase the concentration of the product to saturation 
C) increase the concentration of the enzyme 
D) increase the amount of water in the solution

Question 3

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 4

The number of substrate molecules acted upon per minute by one molecule of enzyme is referred to as the

Accepted Answer

A) optimum number. 
B) optimum rate. 
C) international unit. 
D) turnover number. 
A) optimum number. 
B) optimum rate. 
C) international unit. 
D) turnover number.

Question 5

A substance that when added to a reaction causes the production of more product is called a _____ .

Accepted Answer

A) catalyst 
B) substrate 
C) inhibitor 
D) none of the choices 
A) catalyst 
B) substrate 
C) inhibitor 
D) none of the choices

Question 6

An enzyme useful in diagnosing leukemia is _____ .

Accepted Answer

A) CK 
B) acid phosphatase 
C) lysozyme 
D) LDH 
A) CK 
B) acid phosphatase 
C) lysozyme 
D) LDH

Question 7

Enzyme synthesis is controlled by the genetic information of the individual.

Accepted Answer

A) True 
 B)False

Question 8

The general term which refers to the catalytic ability of an enzyme is

Accepted Answer

A) enzyme turnover. 
B) enzyme activity. 
C) catalytic turnover. 
D) catalytic speed. 
A) enzyme turnover. 
B) enzyme activity. 
C) catalytic turnover. 
D) catalytic speed.

Question 9

If a metal ion  is required to activate an enzyme, it would be considered  a ____.

Accepted Answer

A) cofactor 
B) protoenzyme 
C) coenzyme 
D) zymogen 
A) cofactor 
B) protoenzyme 
C) coenzyme 
D) zymogen

Question 10

Which of the following terms can be used correctly to fill the blank in the following equation?      apoenzyme + ____ → active enzyme

Accepted Answer

A) zymogen 
B) cofactor 
C) isozyme 
D) substrate 
A) zymogen 
B) cofactor 
C) isozyme 
D) substrate

Question 11

Salivary amylase behaves as an enzyme only in the presence of chloride ions. Which of the following terms describes the function of the chloride ion?

Accepted Answer

A) coenzyme 
B) zymogen 
C) activator 
D) active site 
A) coenzyme 
B) zymogen 
C) activator 
D) active site

Question 12

Consider the following figure.  The step labeled A is known to reduce the activity of Enzyme 1.  This would be described as what type of enzyme regulation?

Accepted Answer

A) end product inhibition 
B) feedback inhibition 
C) allosteric inhibition 
D) competitive inhibition 
A) end product inhibition 
B) feedback inhibition 
C) allosteric inhibition 
D) competitive inhibition

Question 13

​ The ability of an enzyme to act on several structurally related substances is called _____ _____.

Accepted Answer

A) absolute specificity 
B) stereochemical specificity 
C) relative specificity 
D) group specificity 
A) absolute specificity 
B) stereochemical specificity 
C) relative specificity 
D) group specificity

Question 14

In an enzyme assay, 4.5 μ mol of substrate was consumed in 3.166 min.  What is the enzyme activity expressed in IU?

Accepted Answer

A) 4.5 IU 
B) 14 IU 
C) 0.70 IU 
D) 1.4 IU 
A) 4.5 IU 
B) 14 IU 
C) 0.70 IU 
D) 1.4 IU

Question 15

​ Which of the following is an example of absolute specificity?

Accepted Answer

A) The hydrolysis of urea catalyzed by urease 
B) The hydrolysis of lipids catalyzed by lipases 
C) The splitting of proteins catalyzed by proteases 
D) The hydrolysis of phosphate esters by phosphatases 
A) The hydrolysis of urea catalyzed by urease 
B) The hydrolysis of lipids catalyzed by lipases 
C) The splitting of proteins catalyzed by proteases 
D) The hydrolysis of phosphate esters by phosphatases

Question 16

An irreversible inhibitor usually forms a covalent bond with the enzyme.

Accepted Answer

A) True 
 B)False

Question 17

What is the general effect of increasing the substrate concentration in a reaction?

Accepted Answer

A) The rate of the reaction will increase significantly. 
B) The rate of the reaction will increase eventually leveling off. 
C) The rate of the reaction will decrease significantly. 
D) The substrate concentration cannot be changed in any chemical reaction. 
A) The rate of the reaction will increase significantly. 
B) The rate of the reaction will increase eventually leveling off. 
C) The rate of the reaction will decrease significantly. 
D) The substrate concentration cannot be changed in any chemical reaction.

Question 18

Which of the following is (are)active enzyme(s)?

Accepted Answer

A) pepsinogen 
B) proelastase 
C) trypsin 
D) all are active enzymes 
A) pepsinogen 
B) proelastase 
C) trypsin 
D) all are active enzymes

Question 19

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 20

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

Exam 20: Enzymes

Which of the following is a common function of many vitamins in the body?

Which modification of the reaction environment will increase the rate of reaction in which an enzyme participates?

Which of the following accurately describes how an enzyme functions?

The number of substrate molecules acted upon per minute by one molecule of enzyme is referred to as the

A substance that when added to a reaction causes the production of more product is called a _____ .

An enzyme useful in diagnosing leukemia is _____ .

Enzyme synthesis is controlled by the genetic information of the individual.

The general term which refers to the catalytic ability of an enzyme is

If a metal ion is required to activate an enzyme, it would be considered a ____.

Which of the following terms can be used correctly to fill the blank in the following equation? apoenzyme + ____ → active enzyme

Salivary amylase behaves as an enzyme only in the presence of chloride ions. Which of the following terms describes the function of the chloride ion?

Consider the following figure. The step labeled A is known to reduce the activity of Enzyme 1. This would be described as what type of enzyme regulation?

​ The ability of an enzyme to act on several structurally related substances is called _____ _____.

In an enzyme assay, 4.5 μ mol of substrate was consumed in 3.166 min. What is the enzyme activity expressed in IU?

​ Which of the following is an example of absolute specificity?

An irreversible inhibitor usually forms a covalent bond with the enzyme.

What is the general effect of increasing the substrate concentration in a reaction?

Which of the following is (are)active enzyme(s)?

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

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

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

The ability of an enzyme to act on several structurally related substances is called _ _.

Which of the following is an example of absolute specificity?