Question 1

Which of the following statements is true of noncompetitive inhibitors?

Accepted Answer

A)  They slow down the rate of reaction. 
B)  They increase the efficiency of an enzyme. 
C)  They have no effect on the shape of the enzyme. 
D)  They increase the activity of an enzyme. 
A)  They slow down the rate of reaction. 
B)  They increase the efficiency of an enzyme. 
C)  They have no effect on the shape of the enzyme. 
D)  They increase the activity of an enzyme.

Question 2

For which of the following reasons is trypsin synthesized as trypsinogen?

Accepted Answer

A)  Trypsin can damage the small intestine. 
B)  Trypsinogen is a more active enzyme than trypsin. 
C)  Trypsin can damage the pancreas. 
D)  Trypsin is a larger molecule than trypsinogen. 
A)  Trypsin can damage the small intestine. 
B)  Trypsinogen is a more active enzyme than trypsin. 
C)  Trypsin can damage the pancreas. 
D)  Trypsin is a larger molecule than trypsinogen.

Question 3

According to the types of reactions that enzymes catalyze, into how many groups are enzymes classified?

Accepted Answer

A)  4 
B)  6 
C)  8 
D)  10 
A)  4 
B)  6 
C)  8 
D)  10

Question 4

Which of the following body fluid samples is used to diagnose the severity of a heart attack?

Accepted Answer

A)  cerebrospinal fluid 
B)  serum 
C)  sweat 
D)  semen 
A)  cerebrospinal fluid 
B)  serum 
C)  sweat 
D)  semen

Question 5

Consider the following two images depicting enzyme behavior.   Which model explains competitive inhibition?

Accepted Answer

A)  A only 
B)  B only 
C)  Both A and B 
A)  A only 
B)  B only 
C)  Both A and B

Question 6

Which of the following changes can cause enzyme activity to either increase or decrease?

Accepted Answer

A)  a change in temperature 
B)  an increase in substrate concentration 
C)  a change in temperature and an increase in substrate concentation 
D)  none of these 
A)  a change in temperature 
B)  an increase in substrate concentration 
C)  a change in temperature and an increase in substrate concentation 
D)  none of these

Question 7

Identify a proenzyme.

Accepted Answer

A)  trypsinogen 
B)  pyruvate kinase 
C)  lactate dehydrogenase 
D)  pepsin 
A)  trypsinogen 
B)  pyruvate kinase 
C)  lactate dehydrogenase 
D)  pepsin

Question 8

An enzyme in an inactive form that can become active after undergoing a chemical change is known as a(n) _____.

Accepted Answer

A)  allosteric enzyme 
B)  cofactor 
C)  isozyme 
D)  zymogen 
A)  allosteric enzyme 
B)  cofactor 
C)  isozyme 
D)  zymogen

Question 9

Consider the following graph for the rate of an enzyme-catalyzed reaction.   What is the approximate optimum pH for carrying out this reaction?

Accepted Answer

A)  5.0 
B)  6.5 
C)  7.5 
D)  8.0 
E)  Any pH between 5.0 and 8.0 
A)  5.0 
B)  6.5 
C)  7.5 
D)  8.0 
E)  Any pH between 5.0 and 8.0

Question 10

Acetylcholinesterase belongs to which group of enzymes?

Accepted Answer

A)  hydrolases 
B)  lyases 
C)  oxidoreductases 
D)  transferases 
A)  hydrolases 
B)  lyases 
C)  oxidoreductases 
D)  transferases

Question 11

Which of the following statements is true of carbonic anhydrase?

Accepted Answer

A)  It assists in the synthesis of specialized enzymes. 
B)  It helps catalyze protein splitting in the blood. 
C)  It is inhibited by acetazolamide. 
D)  It catalyzes the hydrolysis of urea. 
A)  It assists in the synthesis of specialized enzymes. 
B)  It helps catalyze protein splitting in the blood. 
C)  It is inhibited by acetazolamide. 
D)  It catalyzes the hydrolysis of urea.

Question 12

Which of the following enzymes is assayed to diagnose the severity of a heart attack?

Accepted Answer

A)  AST 
B)  CPK 
C)  LDH 
D)  All of these 
A)  AST 
B)  CPK 
C)  LDH 
D)  All of these

Question 13

Which of the following enzymes does not consist of proteins?

Accepted Answer

A)  ribozyme 
B)  aconitase 
C)  lactase 
D)  pepsin 
A)  ribozyme 
B)  aconitase 
C)  lactase 
D)  pepsin

Question 14

Consider the following image depicting enzyme regulation.   Which of the following is depicted by this model?

Accepted Answer

A)  protein modification 
B)  allosterism 
C)  competitive inhibition 
D)  feedback control 
A)  protein modification 
B)  allosterism 
C)  competitive inhibition 
D)  feedback control

Question 15

Which of the following statements is true of inhibition?

Accepted Answer

A)  Both competitive and noncompetitive inhibition are irreversible. 
B)  Both competitive and noncompetitive inhibition are always reversible. 
C)  Competitive inhibition is always irreversible. 
D)  Noncompetitive inhibition is never reversible. 
A)  Both competitive and noncompetitive inhibition are irreversible. 
B)  Both competitive and noncompetitive inhibition are always reversible. 
C)  Competitive inhibition is always irreversible. 
D)  Noncompetitive inhibition is never reversible.

Question 16

Aspartate transaminase belongs to which group of enzymes?

Accepted Answer

A)  hydrolases 
B)  lyases 
C)  oxidoreductases 
D)  transferases 
A)  hydrolases 
B)  lyases 
C)  oxidoreductases 
D)  transferases

Question 17

Which of the following processes is catalyzed by arginase?

Accepted Answer

A)  the conversion of D-arginine to urea and D-ornithine 
B)  the hydrolysis of L-arginine to urea and L-ornithine 
C)  the hydrolysis of L-arginine to urea and D-arginine 
D)  the conversion of both the D and L forms of arginine to urea and the D and L forms of ornithine 
A)  the conversion of D-arginine to urea and D-ornithine 
B)  the hydrolysis of L-arginine to urea and L-ornithine 
C)  the hydrolysis of L-arginine to urea and D-arginine 
D)  the conversion of both the D and L forms of arginine to urea and the D and L forms of ornithine

Question 18

What name is given to the organic cofactor of an enzyme?

Accepted Answer

A)  apoenzyme 
B)  chaperone 
C)  coenzyme 
D)  substrate 
A)  apoenzyme 
B)  chaperone 
C)  coenzyme 
D)  substrate

Question 19

Which of the following changes can cause the rate of enzyme activity to increase linearly?

Accepted Answer

A)  an increase in enzyme concentration 
B)  an increase in substrate concentration 
C)  an increase in temperature 
D)  an increase in pH 
A)  an increase in enzyme concentration 
B)  an increase in substrate concentration 
C)  an increase in temperature 
D)  an increase in pH

Question 20

Which of the following is another name for a proenzyme?

Accepted Answer

A)  allosteric enzyme 
B)  coenzyme 
C)  cofactor 
D)  zymogen 
A)  allosteric enzyme 
B)  coenzyme 
C)  cofactor 
D)  zymogen

Exam 22: Enzymes

Which of the following statements is true of noncompetitive inhibitors?

For which of the following reasons is trypsin synthesized as trypsinogen?

According to the types of reactions that enzymes catalyze, into how many groups are enzymes classified?

Which of the following body fluid samples is used to diagnose the severity of a heart attack?

Consider the following two images depicting enzyme behavior. Which model explains competitive inhibition?

Which of the following changes can cause enzyme activity to either increase or decrease?

Identify a proenzyme.

An enzyme in an inactive form that can become active after undergoing a chemical change is known as a(n) _____.

Consider the following graph for the rate of an enzyme-catalyzed reaction. What is the approximate optimum pH for carrying out this reaction?

Acetylcholinesterase belongs to which group of enzymes?

Which of the following statements is true of carbonic anhydrase?

Which of the following enzymes is assayed to diagnose the severity of a heart attack?

Which of the following enzymes does not consist of proteins?

Consider the following image depicting enzyme regulation. Which of the following is depicted by this model?

Which of the following statements is true of inhibition?

Aspartate transaminase belongs to which group of enzymes?

Which of the following processes is catalyzed by arginase?

What name is given to the organic cofactor of an enzyme?

Which of the following changes can cause the rate of enzyme activity to increase linearly?

Which of the following is another name for a proenzyme?

Matter, Energy, and Measurement

Atoms

Chemical Bonds

Chemical Reactions

Gases, Liquids, and Solids

Solutions and Colloids

Reaction Rates and Chemical Equilibrium

Acids and Bases

Nuclear Chemistry

Organic Chemistry

Alkanes

Alkenes, Alkynes, and Aromatic Compounds

Alcohols, Ethers, and Thiols

Chirality: the Handedness of Molecules

Amines

Aldehydes and Ketones

Carboxylic Acids

Carboxylic Anhydrides, Esters, and Amides

Carbohydrates

Lipids

Proteins

Chemical Communications: Neurotransmitters and Hormones

Nucleotides, Nucleic Acids, and Heredity

Gene Expression and Protein Synthesis

Bioenergetics: How the Body Converts Food to Energy

Specific Catabolic Pathways: Carbohydrate, Lipid, and Protein Metabolism

Biosynthetic Pathways

Nutrition

Immunochemistry

Body Fluids

Filters