Question 1

The equation v = Vmax [S]/(Km + [S])is part of which of the following plots?

Accepted Answer

A) Eadie- Hofstee 
B) Michaelis- Menten 
C) Lineweaver- Burk 
D) both A and B 
E) none of the above 
A) Eadie- Hofstee 
B) Michaelis- Menten 
C) Lineweaver- Burk 
D) both A and B 
E) none of the above

Question 2

Which of the following is/are means whereby a catalyst can lower the activation energy of a reaction?

Accepted Answer

A) quantum tunneling 
B) altering the temperature within the cell to one appropriate for reactions to proceed 
C) inefficient collisions 
D) permanently binding substrates 
E) decreasing the number of reactive molecules 
A) quantum tunneling 
B) altering the temperature within the cell to one appropriate for reactions to proceed 
C) inefficient collisions 
D) permanently binding substrates 
E) decreasing the number of reactive molecules

Question 3

Which of the following variables is NOT part of the Michaelis- Menten equation?

Accepted Answer

A) v 
B) kcat 
C) [S] 
D) Km 
E) Vmax 
A) v 
B) kcat 
C) [S] 
D) Km 
E) Vmax

Question 4

The equation A- PO4 + B -A + B- PO4 would be catalyzed by which of the following classes of enzymes?

Accepted Answer

A) transferases 
B) isomerases 
C) oxidoreductases 
D) ligases 
E) hydrolases 
A) transferases 
B) isomerases 
C) oxidoreductases 
D) ligases 
E) hydrolases

Question 5

A linear relationship between Vmax and enzyme concentration would be expected when

Accepted Answer

A) [S] >> Km. B) [S] << Km. C) [S] = Km. D) both A and B E) both B and C A) [S] >> Km. B) [S] << Km. C) [S] = Km. D) both A and B E) both B and C

Question 6

Which is not one of the major groups of enzymes according to the EC system?

Accepted Answer

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

Question 7

Which of the following is NOT true of the enzyme- substrate interaction?

Accepted Answer

A) Some enzymes accept any of a whole group of substrates. 
B) Many enzymes are extremely specific regarding a substrate. 
C) Cells are often able to carry out metabolic activity with only a handful of enzymes. 
D) Many enzymes cannot recognize a stereoisomer of their substrate. 
E) Carboxypeptidase recognizes any of the amino acids from the carboxyl end of a polypeptide. 
A) Some enzymes accept any of a whole group of substrates. 
B) Many enzymes are extremely specific regarding a substrate. 
C) Cells are often able to carry out metabolic activity with only a handful of enzymes. 
D) Many enzymes cannot recognize a stereoisomer of their substrate. 
E) Carboxypeptidase recognizes any of the amino acids from the carboxyl end of a polypeptide.

Question 8

Substrate activation may involve

Accepted Answer

A) accepting protons from the enzyme. 
B) donation of protons to the enzyme. 
C) a change in enzyme conformation induced by substrate binding. 
D) formation of temporary covalent bonds. 
E) all of the above 
A) accepting protons from the enzyme. 
B) donation of protons to the enzyme. 
C) a change in enzyme conformation induced by substrate binding. 
D) formation of temporary covalent bonds. 
E) all of the above

Question 9

An example of an irreversible inhibitor is

Accepted Answer

A) a noncompetitive inhibitor. 
B) penicillin. 
C) isoleucine. 
D) a competitive inhibitor. 
E) acetylcholinesterase. 
A) a noncompetitive inhibitor. 
B) penicillin. 
C) isoleucine. 
D) a competitive inhibitor. 
E) acetylcholinesterase.

Question 10

All of the following are examples of ribozymes or ribozyme activity EXCEPT

Accepted Answer

A) intron removal from pre- rRNA. 
B) zymogen. 
C) ribonuclease P. 
D) autocatalytic RNAs. 
E) peptidyl transferase. 
A) intron removal from pre- rRNA. 
B) zymogen. 
C) ribonuclease P. 
D) autocatalytic RNAs. 
E) peptidyl transferase.

Question 11

The is the minimum energy required before two molecules can be successful in producing a reaction.

Accepted Answer

The answer of The is the minimum energy required before...

Question 12

A sick person often runs a fever and this fever can inhibit the growth of bacteria because

Accepted Answer

A) enzymes do not function as well at temperatures other than the optimal temperature. 
B) sweating removes prosthetic groups from biological enzymes. 
C) the higher temperature increases the activity of lysases. 
D) bacteria reproduce more rapidly at higher body temperature. 
E) fever blocks synthesis of proteins in the bacterial nucleus. 
A) enzymes do not function as well at temperatures other than the optimal temperature. 
B) sweating removes prosthetic groups from biological enzymes. 
C) the higher temperature increases the activity of lysases. 
D) bacteria reproduce more rapidly at higher body temperature. 
E) fever blocks synthesis of proteins in the bacterial nucleus.

Question 13

An allosteric inhibitor

Accepted Answer

A) binds at the regulatory site. 
B) increases the rate of substrate binding. 
C) binds and activates the high- affinity state of the enzymes. 
D) is identical to the active site. 
E) is converted to an activator by the enzyme. 
A) binds at the regulatory site. 
B) increases the rate of substrate binding. 
C) binds and activates the high- affinity state of the enzymes. 
D) is identical to the active site. 
E) is converted to an activator by the enzyme.

Question 14

The active site for carboxypeptidase

Accepted Answer

A) contains amino acids that are contiguous to one another along the primary sequence of the protein. 
B) involves only six out of a total of 307 amino acids. 
C) uses iron as the prosthetic group. 
D) is formed by the interaction of two polypeptide chains. 
E) contains a glutamate residue at position 69. 
A) contains amino acids that are contiguous to one another along the primary sequence of the protein. 
B) involves only six out of a total of 307 amino acids. 
C) uses iron as the prosthetic group. 
D) is formed by the interaction of two polypeptide chains. 
E) contains a glutamate residue at position 69.

Question 15

Why is the Lineweaver- Burk plot important in enzyme kinetics?

Accepted Answer

A) It is non- linear. 
B) It illustrates enzyme specificity. 
C) It reveals the presence of prosthetic groups in enzymes. 
D) It is a single- reciprocal plot. 
E) It makes it easier to determine Vmax. 
A) It is non- linear. 
B) It illustrates enzyme specificity. 
C) It reveals the presence of prosthetic groups in enzymes. 
D) It is a single- reciprocal plot. 
E) It makes it easier to determine Vmax.

The equation v = Vmax [S]/(Km + [S])is part of which of the following plots?

Which of the following is/are means whereby a catalyst can lower the activation energy of a reaction?

Which of the following variables is NOT part of the Michaelis- Menten equation?

The equation A- PO4 + B -A + B- PO4 would be catalyzed by which of the following classes of enzymes?

A linear relationship between Vmax and enzyme concentration would be expected when

Which is not one of the major groups of enzymes according to the EC system?

Which of the following is NOT true of the enzyme- substrate interaction?

Substrate activation may involve

An example of an irreversible inhibitor is

All of the following are examples of ribozymes or ribozyme activity EXCEPT

The is the minimum energy required before two molecules can be successful in producing a reaction.

A sick person often runs a fever and this fever can inhibit the growth of bacteria because

An allosteric inhibitor

The active site for carboxypeptidase

Why is the Lineweaver- Burk plot important in enzyme kinetics?

A Preview of the Cell

The Chemistry of the Cell

The Macromolecules of the Cell

Cells and Organelles

Bioenergetics: The Flow of Energy in the Cell

Membranes: Their Structure, Function, and Chemistry

Transport Across Membranes: Overcoming the Permeability Barrier

Chemotrophic Energy Metabolism: Glycolysis and Fermentation

Chemotrophic Energy Metabolism: Aerobic Respiration

Phototrophic Energy Metabolism: Photosynthesis

The Endomembrane System and Peroxisomes

Signal Transduction Mechanisms: I Electrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Ii Messengers and Receptors

Cytoskeletal Systems

Cellular Movement: Motility and Contractility

Beyond the Cell: Cell Adhesion, Cell Junctions, and Extracellular Structures

The Structural Basis of Cellular Information: DNA, Chromosomes, and the Nucleus

The Cell Cycle, Dna Replication, and Mitosis

Sexual Reproduction, Meiosis, and Genetic Recombination

Gene Expression: I the Genetic Code and Transcription

Gene Expression: II Protein Synthesis and Sorting

The Regulation of Gene Expression

Cancer Cells

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Exam 6: Enzymes: The Catalysts of Life

The equation v = Vmax [S]/(Km + [S])is part of which of the following plots?

Which of the following is/are means whereby a catalyst can lower the activation energy of a reaction?

Which of the following variables is NOT part of the Michaelis- Menten equation?

The equation A- PO4 + B -A + B- PO4 would be catalyzed by which of the following classes of enzymes?

A linear relationship between Vmax and enzyme concentration would be expected when

Which is not one of the major groups of enzymes according to the EC system?

Which of the following is NOT true of the enzyme- substrate interaction?

Substrate activation may involve

An example of an irreversible inhibitor is

All of the following are examples of ribozymes or ribozyme activity EXCEPT

The is the minimum energy required before two molecules can be successful in producing a reaction.

A sick person often runs a fever and this fever can inhibit the growth of bacteria because

An allosteric inhibitor

The active site for carboxypeptidase

Why is the Lineweaver- Burk plot important in enzyme kinetics?

A Preview of the Cell

The Chemistry of the Cell

The Macromolecules of the Cell

Cells and Organelles

Bioenergetics: The Flow of Energy in the Cell

Membranes: Their Structure, Function, and Chemistry

Transport Across Membranes: Overcoming the Permeability Barrier

Chemotrophic Energy Metabolism: Glycolysis and Fermentation

Chemotrophic Energy Metabolism: Aerobic Respiration

Phototrophic Energy Metabolism: Photosynthesis

The Endomembrane System and Peroxisomes

Signal Transduction Mechanisms: I Electrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Ii Messengers and Receptors

Cytoskeletal Systems

Cellular Movement: Motility and Contractility

Beyond the Cell: Cell Adhesion, Cell Junctions, and Extracellular Structures

The Structural Basis of Cellular Information: DNA, Chromosomes, and the Nucleus

The Cell Cycle, Dna Replication, and Mitosis

Sexual Reproduction, Meiosis, and Genetic Recombination

Gene Expression: I the Genetic Code and Transcription

Gene Expression: II Protein Synthesis and Sorting

The Regulation of Gene Expression

Cancer Cells

Filters