Question 1

Enzymes,being proteins,are sensitive to the temperature and will be denatured by high temperatures.

Accepted Answer

A) True 
 B)False

Question 2

Noncompetitive inhibitors often resemble the natural substrate in structure.

Accepted Answer

A) True 
 B)False

Question 3

Noncompetitive inhibitors bind strongly to the active site.

Accepted Answer

A) True 
 B)False

Question 4

What is the reason for performing an enzyme assay?

Accepted Answer

A)  to determine the number of enzyme molecules per liter 
B)  to determine the number of enzyme molecules per mL 
C)  to determine the activity of an enzyme 
D)  to determine the number of enzymes present 
A)  to determine the number of enzyme molecules per liter 
B)  to determine the number of enzyme molecules per mL 
C)  to determine the activity of an enzyme 
D)  to determine the number of enzymes present

Question 5

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 6

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

Accepted Answer

A) True 
 B)False

Question 7

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 8

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 9

Which of the following disorders results from a deficiency of the enzyme tyroinase?

Accepted Answer

A)  Albinism 
B)  Galactosemia 
C)  Phenylketonuria 
D)  Homocystinuria 
A)  Albinism 
B)  Galactosemia 
C)  Phenylketonuria 
D)  Homocystinuria

Question 10

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 11

Enzyme concentration has what effect on the rate of an enzyme catalyzed reaction?

Accepted Answer

A)  increases 
B)  decreases 
C)  no effect 
D)  increases until reaching a maximum 
A)  increases 
B)  decreases 
C)  no effect 
D)  increases until reaching a maximum

Question 12

A neighbor comes to you having just moments ago ingested an unknown amount of antifreeze.You are miles from the nearest hospital.Which of the following is your best course of action after calling 911?

Accepted Answer

A)  To make their last moments as pleasant as possible. 
B)  Give them enough whiskey to nearly get them intoxicated. 
C)  Give them methanol to detoxify the antifreeze. 
D)  Do nothing because antifreeze is not toxic to people. 
A)  To make their last moments as pleasant as possible. 
B)  Give them enough whiskey to nearly get them intoxicated. 
C)  Give them methanol to detoxify the antifreeze. 
D)  Do nothing because antifreeze is not toxic to people.

Question 13

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

Question 14

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 15

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

Accepted Answer

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

Question 16

Which of the following enzyme types have proven especially useful in diagnostic medicine?

Accepted Answer

A)  allosteric enzyme 
B)  proenzymes 
C)  isoenzymes 
D)  induced enzymes 
A)  allosteric enzyme 
B)  proenzymes 
C)  isoenzymes 
D)  induced enzymes

Question 17

Enzymes are proteins that speed up a chemical reaction;inhibitors slow down chemical reactions.

Accepted Answer

A) True 
 B)False

Question 18

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 19

The use of antibiotic creams and ointments should be restricted.Why?

Accepted Answer

A)  The excessive use will affect the flexibility of the skin in the immediate area. 
B)  There is a possibility that the antibiotic will cause the skin to become dry. 
C)  There is a possibility that antibiotic immune strains of bacteria will develop. 
D)  There is more than one correct response. 
A)  The excessive use will affect the flexibility of the skin in the immediate area. 
B)  There is a possibility that the antibiotic will cause the skin to become dry. 
C)  There is a possibility that antibiotic immune strains of bacteria will develop. 
D)  There is more than one correct response.

Question 20

Enzymes have specific temperature and pH ranges within which they function best.

Accepted Answer

A) True 
 B)False

Exam 20: Enzymes

Enzymes,being proteins,are sensitive to the temperature and will be denatured by high temperatures.

Noncompetitive inhibitors often resemble the natural substrate in structure.

Noncompetitive inhibitors bind strongly to the active site.

What is the reason for performing an enzyme assay?

Which of the following accurately describes how an enzyme functions?

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

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

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?

Which of the following disorders results from a deficiency of the enzyme tyroinase?

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

Enzyme concentration has what effect on the rate of an enzyme catalyzed reaction?

A neighbor comes to you having just moments ago ingested an unknown amount of antifreeze.You are miles from the nearest hospital.Which of the following is your best course of action after calling 911?

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

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

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

Which of the following enzyme types have proven especially useful in diagnostic medicine?

Enzymes are proteins that speed up a chemical reaction;inhibitors slow down chemical reactions.

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

The use of antibiotic creams and ointments should be restricted.Why?

Enzymes have specific temperature and pH ranges within which they function best.

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

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