Question 1

Match the following.
-zymogen

Accepted Answer

A) a description of the catalytic activity of an enzyme,where a small value means that very few molecules are acted on in a unit of time 
B) a substance that prevents harmful reactions of free radicals 
C) any process that increases the rate of an enzyme catalyzed reaction 
D) a type of enzyme that catalyzes the removal of a small molecule from a larger one 
E) a type of enzyme that catalyzes the internal rearrangement of molecules
F)an inactive form of an enzyme; also called a proenzyme
G)a description of enzyme activity based on an exact match between the shapes of the active site and the substrate molecule
H)a type of enzyme that catalyzes the joining of two molecules together
I)a type of enzyme that catalyzes the transfer of a functional group from one molecule to another
J)a type of enzyme that catalyzes the breakdown of large molecules by reaction with water
K)a description of enzyme activity based on the ability of the enzyme to change shape in order to accommodate substrate molecules
L)a type of enzyme that catalyzes oxidation or reduction reactions
M)a small organic molecule necessary for good health that must be obtained in the diet
N)any process which decreases the rate of an enzyme catalyzed reaction 
A) a description of the catalytic activity of an enzyme,where a small value means that very few molecules are acted on in a unit of time 
B) a substance that prevents harmful reactions of free radicals 
C) any process that increases the rate of an enzyme catalyzed reaction 
D) a type of enzyme that catalyzes the removal of a small molecule from a larger one 
E) a type of enzyme that catalyzes the internal rearrangement of molecules
F)an inactive form of an enzyme; also called a proenzyme
G)a description of enzyme activity based on an exact match between the shapes of the active site and the substrate molecule
H)a type of enzyme that catalyzes the joining of two molecules together
I)a type of enzyme that catalyzes the transfer of a functional group from one molecule to another
J)a type of enzyme that catalyzes the breakdown of large molecules by reaction with water
K)a description of enzyme activity based on the ability of the enzyme to change shape in order to accommodate substrate molecules
L)a type of enzyme that catalyzes oxidation or reduction reactions
M)a small organic molecule necessary for good health that must be obtained in the diet
N)any process which decreases the rate of an enzyme catalyzed reaction F

Question 2

The reactant in an enzyme-catalyzed reaction is called the

Accepted Answer

A) hormone. 
B) substrate. 
C) cofactor. 
D) inhibitor. 
E) vitamin. 
A) hormone. 
B) substrate. 
C) cofactor. 
D) inhibitor. 
E) vitamin. B

Question 3

Match the following.
-transferase

Accepted Answer

A) a description of the catalytic activity of an enzyme,where a small value means that very few molecules are acted on in a unit of time 
B) a substance that prevents harmful reactions of free radicals 
C) any process that increases the rate of an enzyme catalyzed reaction 
D) a type of enzyme that catalyzes the removal of a small molecule from a larger one 
E) a type of enzyme that catalyzes the internal rearrangement of molecules
F)an inactive form of an enzyme; also called a proenzyme
G)a description of enzyme activity based on an exact match between the shapes of the active site and the substrate molecule
H)a type of enzyme that catalyzes the joining of two molecules together
I)a type of enzyme that catalyzes the transfer of a functional group from one molecule to another
J)a type of enzyme that catalyzes the breakdown of large molecules by reaction with water
K)a description of enzyme activity based on the ability of the enzyme to change shape in order to accommodate substrate molecules
L)a type of enzyme that catalyzes oxidation or reduction reactions
M)a small organic molecule necessary for good health that must be obtained in the diet
N)any process which decreases the rate of an enzyme catalyzed reaction 
A) a description of the catalytic activity of an enzyme,where a small value means that very few molecules are acted on in a unit of time 
B) a substance that prevents harmful reactions of free radicals 
C) any process that increases the rate of an enzyme catalyzed reaction 
D) a type of enzyme that catalyzes the removal of a small molecule from a larger one 
E) a type of enzyme that catalyzes the internal rearrangement of molecules
F)an inactive form of an enzyme; also called a proenzyme
G)a description of enzyme activity based on an exact match between the shapes of the active site and the substrate molecule
H)a type of enzyme that catalyzes the joining of two molecules together
I)a type of enzyme that catalyzes the transfer of a functional group from one molecule to another
J)a type of enzyme that catalyzes the breakdown of large molecules by reaction with water
K)a description of enzyme activity based on the ability of the enzyme to change shape in order to accommodate substrate molecules
L)a type of enzyme that catalyzes oxidation or reduction reactions
M)a small organic molecule necessary for good health that must be obtained in the diet
N)any process which decreases the rate of an enzyme catalyzed reaction I

Question 4

Enzymes have an optimum temperature for their catalytic activity.This is best explained by the balance between the ________ number of collisions and the ________ rate of denaturation of the enzyme as temperatures increase.

Accepted Answer

A) increased; increased 
B) decreased; increased 
C) increased; decreased 
D) decreased; decreased 
E) none of the above 
A) increased; increased 
B) decreased; increased 
C) increased; decreased 
D) decreased; decreased 
E) none of the above

Question 5

A vitamin is

Accepted Answer

A) a nutrient involving trace metals that is necessary for good health. 
B) a polypeptide used to manufacture enzymes. 
C) a lipid complex which is an important part of all cells. 
D) a small organic molecule obtained from the diet and necessary for good health. 
E) a complex molecule of four interlocking hydrocarbon rings. 
A) a nutrient involving trace metals that is necessary for good health. 
B) a polypeptide used to manufacture enzymes. 
C) a lipid complex which is an important part of all cells. 
D) a small organic molecule obtained from the diet and necessary for good health. 
E) a complex molecule of four interlocking hydrocarbon rings.

Question 6

The nonprotein portion required by some enzymes for proper functioning is called a(an)

Accepted Answer

A) zymogen. 
B) substrate. 
C) inhibitor. 
D) cofactor. 
E) activator. 
A) zymogen. 
B) substrate. 
C) inhibitor. 
D) cofactor. 
E) activator.

Question 7

Enzymes are members of which class of biomolecules?

Accepted Answer

A) carbohydrates 
B) lipids 
C) nucleic acids 
D) proteins 
E) steroids 
A) carbohydrates 
B) lipids 
C) nucleic acids 
D) proteins 
E) steroids

Question 8

Explain how an allosteric enzyme is regulated.

Accepted Answer

An allosteric enzyme is regulated by the

Question 9

Activation of zymogens involves the chemical process of

Accepted Answer

A) hydrogen bonding. 
B) covalent modification. 
C) complete hydrolysis. 
D) denaturation. 
E) oxidation-reduction. 
A) hydrogen bonding. 
B) covalent modification. 
C) complete hydrolysis. 
D) denaturation. 
E) oxidation-reduction.

Question 10

Another term for substances that bind irreversibly with the active site of an enzyme is

Accepted Answer

A) activators. 
B) poisons. 
C) coenzymes. 
D) hormones. 
E) zymogens. 
A) activators. 
B) poisons. 
C) coenzymes. 
D) hormones. 
E) zymogens.

Question 11

Enzymes increase the rates of only certain reactions involving certain substances.This general characteristic is called

Accepted Answer

A) selectivity. 
B) specificity. 
C) enzyme regulation. 
D) catalytic efficiency. 
E) enzyme inhibition. 
A) selectivity. 
B) specificity. 
C) enzyme regulation. 
D) catalytic efficiency. 
E) enzyme inhibition.

Question 12

Which of the following is the typical shape of a plot showing the rate of an enzyme-catalyzed reaction as a function of the pH?

Accepted Answer

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

Question 13

The theory of enzyme mechanism that suggests a rigid,inflexible molecule is the ________ model.

Accepted Answer

A) coenzyme 
B) induced-fit 
C) lock-and-key 
D) substrate specific 
E) active site 
A) coenzyme 
B) induced-fit 
C) lock-and-key 
D) substrate specific 
E) active site

Question 14

A multi-step biochemical process in which the rate of an early step is affected by the concentration of products of a later step is said to be subject to

Accepted Answer

A) decomposition. 
B) feedback control. 
C) hydrolysis. 
D) pH control. 
E) all of the above 
A) decomposition. 
B) feedback control. 
C) hydrolysis. 
D) pH control. 
E) all of the above

Question 15

Noncompetitive inhibition can be overcome by

Accepted Answer

A) increasing the concentration of substrate. 
B) increasing the concentration of enzyme. 
C) decreasing the concentration of inhibitor. 
D) decreasing the concentration of products. 
E) decreasing the concentration of substrate. 
A) increasing the concentration of substrate. 
B) increasing the concentration of enzyme. 
C) decreasing the concentration of inhibitor. 
D) decreasing the concentration of products. 
E) decreasing the concentration of substrate.

Question 16

All of the following are mechanisms for control of enzyme activity except

Accepted Answer

A) inhibition. 
B) feedback. 
C) allosteric interactions. 
D) genetic regulation. 
E) hydrolysis. 
A) inhibition. 
B) feedback. 
C) allosteric interactions. 
D) genetic regulation. 
E) hydrolysis.

Question 17

When substrate molecules occupy all of the active sites in the enzyme available for a particular reaction,the enzyme is said to be

Accepted Answer

A) denatured. 
B) hydrolyzed. 
C) activated. 
D) inhibited. 
E) saturated. 
A) denatured. 
B) hydrolyzed. 
C) activated. 
D) inhibited. 
E) saturated.

Question 18

A synthetase can be classified as a(an)________ because its function is joining two molecules together.

Accepted Answer

A) ligase 
B) isomerase 
C) oxidoreductase 
D) transferase 
E) hydrolase 
A) ligase 
B) isomerase 
C) oxidoreductase 
D) transferase 
E) hydrolase

Question 19

All of the following vitamins are fat soluble except

Accepted Answer

A) Vitamin A. 
B) Vitamin K. 
C) Vitamin C. 
D) Vitamin D. 
E) Vitamin E. 
A) Vitamin A. 
B) Vitamin K. 
C) Vitamin C. 
D) Vitamin D. 
E) Vitamin E.

Question 20

In a normal biochemical system,the rate of a specific reaction is determined by

Accepted Answer

A) pH and temperature. 
B) pH and enzyme efficiency. 
C) temperature and enzyme efficiency. 
D) temperature and substrate concentration. 
E) enzyme efficiency and substrate concentration. 
A) pH and temperature. 
B) pH and enzyme efficiency. 
C) temperature and enzyme efficiency. 
D) temperature and substrate concentration. 
E) enzyme efficiency and substrate concentration.

Exam 19: Enzymes and Vitamins

Match the following. -zymogen

The reactant in an enzyme-catalyzed reaction is called the

Match the following. -transferase

Enzymes have an optimum temperature for their catalytic activity.This is best explained by the balance between the ________ number of collisions and the ________ rate of denaturation of the enzyme as temperatures increase.

A vitamin is

The nonprotein portion required by some enzymes for proper functioning is called a(an)

Enzymes are members of which class of biomolecules?

Explain how an allosteric enzyme is regulated.

Activation of zymogens involves the chemical process of

Another term for substances that bind irreversibly with the active site of an enzyme is

Enzymes increase the rates of only certain reactions involving certain substances.This general characteristic is called

Which of the following is the typical shape of a plot showing the rate of an enzyme-catalyzed reaction as a function of the pH?

The theory of enzyme mechanism that suggests a rigid,inflexible molecule is the ________ model.

A multi-step biochemical process in which the rate of an early step is affected by the concentration of products of a later step is said to be subject to

Noncompetitive inhibition can be overcome by

All of the following are mechanisms for control of enzyme activity except

When substrate molecules occupy all of the active sites in the enzyme available for a particular reaction,the enzyme is said to be

A synthetase can be classified as a(an)________ because its function is joining two molecules together.

All of the following vitamins are fat soluble except

In a normal biochemical system,the rate of a specific reaction is determined by

Matter and Measurements

Atoms and the Periodic Table

Ionic Compounds

Molecular Compounds

Classification and Balancing of Chemical Reactions

Chemical Reactions: Mole and Mass Relationships

Chemical Reactions: Energy, rates, and Equilibrium

Gases, liquids, and Solids

Solutions

Acids and Bases

Nuclear Chemistry

Introduction to Organic Chemistry: Alkanes

Alkenes, alkynes, and Aromatic Compounds

Some Compounds With Oxygen, sulfur, or a Halogen

Amines

Aldehydes and Ketones

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

The Generation of Biochemical Energy

Carbohydrates

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Protein and Amino Acid Metabolism

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

Enzymes have an optimum temperature for their catalytic activity.This is best explained by the balance between the number of collisions and the rate of denaturation of the enzyme as temperatures increase.