Question 1

Azidothymidine (AZT)is a(n)________ used in the treatment of AIDS and targets the enzyme reverse transcriptase.

Accepted Answer

The answer of Azidothymidine (AZT)is a(n)________ used in the treatment...

Question 2

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

Accepted Answer

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

Question 3

Enzyme activity may be regulated by several means.Can you identify the mode of regulation for each of the following examples?
a.When glucose is converted to glucose-6-phosphate by hexokinase,the accumulation of glucose-6-phosphate inhibits the reaction.
b.A foreign substance is added to the reaction in part a above.This substance binds to hexokinase and prevents its ability to catalyze the reaction.
c.An inactive form of an enzyme becomes active after being phosphorylated.
d.Pepsinogen becomes pepsin after being released into the lumen of the stomach.
e.In a series of enzymatic reactions,it is found that the product of the last reaction inhibits the first enzyme in the series of reactions.

Accepted Answer

a.substrate-level regulation
b

Question 4

In the Eadie-Hofstee plot,

Accepted Answer

A) the x axis shows substrate concentration. 
B) the y intercept is Vmax. 
C) the slope can be used to determine Km. 
D) the y axis shows v/[S]. 
E) both choices C and D 
A) the x axis shows substrate concentration. 
B) the y intercept is Vmax. 
C) the slope can be used to determine Km. 
D) the y axis shows v/[S]. 
E) both choices C and D

Question 5

An enzyme influences the structure of which of the following?

Accepted Answer

A) substrate 
B) product 
C) transition state 
D) cofactor 
E) intermediate 
A) substrate 
B) product 
C) transition state 
D) cofactor 
E) intermediate

Question 6

Which of the following is an example of a prosthetic group?

Accepted Answer

A) a zinc ion 
B) a glycine residue 
C) a polypeptide chain 
D) a nickel catalyst 
E) carboxypeptidase A 
A) a zinc ion 
B) a glycine residue 
C) a polypeptide chain 
D) a nickel catalyst 
E) carboxypeptidase A

Question 7

Which of the following is an enzyme?

Accepted Answer

A) iron 
B) histidine 
C) carboxypeptidase A 
D) ATP 
E) N-acetylmuramic acid 
A) iron 
B) histidine 
C) carboxypeptidase A 
D) ATP 
E) N-acetylmuramic acid

Question 8

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) uses iron as the prosthetic group. 
C) involves only 6 out of a total of 307 amino acids. 
D) contains a glutamate residue at position 69. 
E) is formed by the interaction of two polypeptide chains. 
A) contains amino acids that are contiguous to one another along the primary sequence of the protein. 
B) uses iron as the prosthetic group. 
C) involves only 6 out of a total of 307 amino acids. 
D) contains a glutamate residue at position 69. 
E) is formed by the interaction of two polypeptide chains.

Question 9

The site on an enzyme that is designated for the substrate bind is called the ________.

Accepted Answer

The answer of The site on an enzyme that is...

Question 10

Mixed type inhibitors will affect the ________ of an enzymatic reaction.

Accepted Answer

A) Km 
B) Vmax 
C) S 
D) P 
E) both choices A and B 
A) Km 
B) Vmax 
C) S 
D) P 
E) both choices A and B

Question 11

Match between columns
                        Premises: [S]
-1/Km
Km/Vmax
Km
kcat
Vmax

Accepted Answer

The Answer of slope of the Eadie-Hofstee plot and maximum is...

Question 12

Nonprotein catalysts are known as ________.

Accepted Answer

The answer of Nonprotein catalysts are known as ________....

Question 13

According to the EC system,which is not one of the major groups of enzymes?

Accepted Answer

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

Question 14

An organism that is labeled a cryophile is capable of

Accepted Answer

A) growth at 4°C. 
B) growth in hydrothermal vents. 
C) synthesizing liquid nitrogen. 
D) producing large quantities of liquid hydrogen. 
E) both choices C and D 
A) growth at 4°C. 
B) growth in hydrothermal vents. 
C) synthesizing liquid nitrogen. 
D) producing large quantities of liquid hydrogen. 
E) both choices C and D

Question 15

Match between columns
                        Premises: double-reciprocal
ribozymes
feedback inhibition
prosthetic group
induced-fit model
proteolytic cleavage
covalent modification

Accepted Answer

The Answer of trypsin and distortion of substrate and enzyme is...

Question 16

As new enzymes are discovered,the EC system for naming enzymes is to be used.The names are to be based on which of the following criteria?

Accepted Answer

A) the name of the substrate 
B) a description of substrate function 
C) an indication of the size of the substrate 
D) the six major classes of enzyme function 
E) the size of the enzyme 
A) the name of the substrate 
B) a description of substrate function 
C) an indication of the size of the substrate 
D) the six major classes of enzyme function 
E) the size of the enzyme

Question 17

The Michaelis constant

Accepted Answer

A) can be determined using the Lineweaver-Burk plot. 
B) is equal to twice the Vmax. 
C) is equal to the substrate concentration at Vmax/2. 
D) both choices A and C 
E) choices A, B, and C 
A) can be determined using the Lineweaver-Burk plot. 
B) is equal to twice the Vmax. 
C) is equal to the substrate concentration at Vmax/2. 
D) both choices A and C 
E) choices A, B, and C

Question 18

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...

Azidothymidine (AZT)is a(n)________ used in the treatment of AIDS and targets the enzyme reverse transcriptase.

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

In the Eadie-Hofstee plot,

An enzyme influences the structure of which of the following?

Which of the following is an example of a prosthetic group?

Which of the following is an enzyme?

The active site for carboxypeptidase

The site on an enzyme that is designated for the substrate bind is called the ________.

Mixed type inhibitors will affect the ________ of an enzymatic reaction.

Nonprotein catalysts are known as ________.

According to the EC system,which is not one of the major groups of enzymes?

An organism that is labeled a cryophile is capable of

As new enzymes are discovered,the EC system for naming enzymes is to be used.The names are to be based on which of the following criteria?

The Michaelis constant

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

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: Ielectrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Iimessengers and Receptors

Cytoskeletal Systems

Cellular Movement: Motility and Contractility

Beyond the Cell: Cell Adhesions, 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: Ithe Genetic Code and Transcription

Gene Expression: Iiprotein Synthesis and Sorting

The Regulation of Gene Expression

Cancer Cells

Filters

Exam 6: Enzymes: the Catalysts of Life

Azidothymidine (AZT)is a(n)________ used in the treatment of AIDS and targets the enzyme reverse transcriptase.

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

In the Eadie-Hofstee plot,

An enzyme influences the structure of which of the following?

Which of the following is an example of a prosthetic group?

Which of the following is an enzyme?

The active site for carboxypeptidase

The site on an enzyme that is designated for the substrate bind is called the ________.

Mixed type inhibitors will affect the ________ of an enzymatic reaction.

Nonprotein catalysts are known as ________.

According to the EC system,which is not one of the major groups of enzymes?

An organism that is labeled a cryophile is capable of

As new enzymes are discovered,the EC system for naming enzymes is to be used.The names are to be based on which of the following criteria?

The Michaelis constant

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

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: Ielectrical and Synaptic Signaling in Neurons

Signal Transduction Mechanisms: Iimessengers and Receptors

Cytoskeletal Systems

Cellular Movement: Motility and Contractility

Beyond the Cell: Cell Adhesions, 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: Ithe Genetic Code and Transcription

Gene Expression: Iiprotein Synthesis and Sorting

The Regulation of Gene Expression

Cancer Cells

Filters