Question 1

When a metal ion such as Pb(II)interferes with the functioning of an enzyme,the most probable mechanism is

Accepted Answer

A) feedback control. 
B) reversible noncompetitive inhibition. 
C) genetic control. 
D) reversible competitive inhibition. 
E) irreversible inhibition. 
A) feedback control. 
B) reversible noncompetitive inhibition. 
C) genetic control. 
D) reversible competitive inhibition. 
E) irreversible inhibition.

Question 2

When there is an increase in temperature it can affect an enzyme-catalyzed reaction by

Accepted Answer

A) increasing the reaction rate. 
B) decreasing the reaction rate. 
C) both increasing and decreasing the reaction rate. 
D) causing a different substrate to be used. 
A) increasing the reaction rate. 
B) decreasing the reaction rate. 
C) both increasing and decreasing the reaction rate. 
D) causing a different substrate to be used.

Question 3

Match the following.
-lock-and-key model

Accepted Answer

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

Question 4

Transaminase can be classified as a(an)________ because its function is moving an amine group from one molecule to another.

Accepted Answer

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

Question 5

The tertiary structure of most enzymes is

Accepted Answer

A) an α-helix. 
B) a β-pleated sheet. 
C) fibrous. 
D) globular. 
E) none of these 
A) an α-helix. 
B) a β-pleated sheet. 
C) fibrous. 
D) globular. 
E) none of these

Question 6

All of the following statements concerning vitamins are true except

Accepted Answer

A) fat-soluble vitamins have a high proportion of polar carbonyl and hydroxyl groups. 
B) it is possible to overdose on fat-soluble vitamins because they accumulate in fatty tissues. 
C) it is difficult to overdose on water-soluble vitamins because excess amounts can be excreted in the urine. 
D) vitamins A,D,E,and K are fat-soluble. 
E) vitamin C and the B vitamins are water-soluble. 
A) fat-soluble vitamins have a high proportion of polar carbonyl and hydroxyl groups. 
B) it is possible to overdose on fat-soluble vitamins because they accumulate in fatty tissues. 
C) it is difficult to overdose on water-soluble vitamins because excess amounts can be excreted in the urine. 
D) vitamins A,D,E,and K are fat-soluble. 
E) vitamin C and the B vitamins are water-soluble.

Question 7

Match the following.
-oxidoreductase

Accepted Answer

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

Question 8

What type of biochemical reaction would you expect aspartate transaminase to catalyze?

Accepted Answer

A) Transfer of a carbonyl group from aspartate to another substrate. 
B) Transfer of an amino group from aspartate to another substrate. 
C) Transfer of an amino group to aspartate. 
D) Transfer of a carboxylate group from aspartate to another substrate. 
E) none of the above 
A) Transfer of a carbonyl group from aspartate to another substrate. 
B) Transfer of an amino group from aspartate to another substrate. 
C) Transfer of an amino group to aspartate. 
D) Transfer of a carboxylate group from aspartate to another substrate. 
E) none of the above

Question 9

Which of these factors explain how an enzyme works?

Accepted Answer

A) The orientation of the reactants. 
B) The weakening of bond energies in the reactants. 
C) The closeness of the reactants to each other in the active site. 
D) all of the above 
E) none of the above 
A) The orientation of the reactants. 
B) The weakening of bond energies in the reactants. 
C) The closeness of the reactants to each other in the active site. 
D) all of the above 
E) none of the above

When a metal ion such as Pb(II)interferes with the functioning of an enzyme,the most probable mechanism is

When there is an increase in temperature it can affect an enzyme-catalyzed reaction by

Match the following. -lock-and-key model

Transaminase can be classified as a(an)________ because its function is moving an amine group from one molecule to another.

The tertiary structure of most enzymes is

All of the following statements concerning vitamins are true except

Match the following. -oxidoreductase

What type of biochemical reaction would you expect aspartate transaminase to catalyze?

Which of these factors explain how an enzyme works?

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

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters

Exam 19: Enzymes and Vitamins

When a metal ion such as Pb(II)interferes with the functioning of an enzyme,the most probable mechanism is

When there is an increase in temperature it can affect an enzyme-catalyzed reaction by

Match the following. -lock-and-key model

Transaminase can be classified as a(an)________ because its function is moving an amine group from one molecule to another.

The tertiary structure of most enzymes is

All of the following statements concerning vitamins are true except

Match the following. -oxidoreductase

What type of biochemical reaction would you expect aspartate transaminase to catalyze?

Which of these factors explain how an enzyme works?

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

Aldehydes and Ketones

Amines

Carboxylic Acids and Their Derivatives

Amino Acids and Proteins

Carbohydrates

The Generation of Biochemical Energy

Carbohydrate Metabolism

Lipids

Lipid Metabolism

Protein and Amino Acid Metabolism

Nucleic Acids and Protein Synthesis

Genomics

Chemical Messengers: Hormones, neurotransmitters, and Drugs

Body Fluids

Filters