Question 1

How do each of these compounds affect the function of ATCase?

Accepted Answer

A)  ATP inhibits and CTP activates 
B)  ATP activates and CTP inhibits 
C)  Both ATP and CTP inhibit 
D)  Both ATP and CTP activate 
E)  none of these is true 
A)  ATP inhibits and CTP activates 
B)  ATP activates and CTP inhibits 
C)  Both ATP and CTP inhibit 
D)  Both ATP and CTP activate 
E)  none of these is true

Question 2

The concerted and sequential models for the behavior of allosteric enzymes differ in

Accepted Answer

A)  the conformational change in the enzyme in one model and not in the other. 
B)  the number of predicted binding sites on the enzyme. 
C)  the manner in which changes in quaternary structure take place. 
D)  the response of the enzyme to changes in temperature. 
A)  the conformational change in the enzyme in one model and not in the other. 
B)  the number of predicted binding sites on the enzyme. 
C)  the manner in which changes in quaternary structure take place. 
D)  the response of the enzyme to changes in temperature.

Question 3

Cofactors are

Accepted Answer

A)  non-protein in chemical nature. 
B)  always small proteins. 
C)  modified amino acids. 
D)  never required for enzymatic activity. 
A)  non-protein in chemical nature. 
B)  always small proteins. 
C)  modified amino acids. 
D)  never required for enzymatic activity.

Question 4

Which of the following does not apply to the concerted model for subunit behavior:

Accepted Answer

A)  Each subunit can exist in a relaxed (R) and taut (T) conformation. 
B)  All subunits will be in either the R or the T conformation at the same time. 
C)  Some subunits can be in the R state while others are in the T state. 
D)  The presence of inhibitors will lead to more of the enzyme being in the T form 
E)  the presence of activators will lead to more of the enzyme being in the R form 
A)  Each subunit can exist in a relaxed (R) and taut (T) conformation. 
B)  All subunits will be in either the R or the T conformation at the same time. 
C)  Some subunits can be in the R state while others are in the T state. 
D)  The presence of inhibitors will lead to more of the enzyme being in the T form 
E)  the presence of activators will lead to more of the enzyme being in the R form

Question 5

Which of the following is not a difference between the concerted model and the sequential model of allosteric enzymes?

Accepted Answer

A)  The sequential model allows for different subunits to be in different conformations while the concerted model does not 
B)  Negative cooperativity can be explained by the sequential model but not by the concerted model 
C)  Positive cooperativity can be explained by the sequential model but not by the concerted model 
D)  The sequential model is explained better by considering the induced-fit model of substrate binding, whereas the concerted model focuses on perturbing the equilibrium between the T and R forms. 
A)  The sequential model allows for different subunits to be in different conformations while the concerted model does not 
B)  Negative cooperativity can be explained by the sequential model but not by the concerted model 
C)  Positive cooperativity can be explained by the sequential model but not by the concerted model 
D)  The sequential model is explained better by considering the induced-fit model of substrate binding, whereas the concerted model focuses on perturbing the equilibrium between the T and R forms.

Question 6

Phosphorylation and allosteric control of enzymes.

Accepted Answer

A)  are not involved in reactions of carbohydrates. 
B)  play an insignificant role in generating energy. 
C)  are important processes in prokaryotes, but not in eukaryotes. 
D)  can be combined to afford a high degree of control over enzymatic reactions. 
E)  none of these 
A)  are not involved in reactions of carbohydrates. 
B)  play an insignificant role in generating energy. 
C)  are important processes in prokaryotes, but not in eukaryotes. 
D)  can be combined to afford a high degree of control over enzymatic reactions. 
E)  none of these

How do each of these compounds affect the function of ATCase?

The concerted and sequential models for the behavior of allosteric enzymes differ in

Cofactors are

Which of the following does not apply to the concerted model for subunit behavior:

Which of the following is not a difference between the concerted model and the sequential model of allosteric enzymes?

Phosphorylation and allosteric control of enzymes.

Biochemistry and the Organization of Cells

Water the Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins Enzymes

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids How Structure Conveys Information

Biosynthesis of Nucleic Acids Replication

Transcription of the Genetic Code the Biosynthesis of Rna

Protein Synthesis Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses Cancer and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism Cellular Signaling

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Exam 7: The Behavior of Proteins Enzymes Mechanisms and Control

How do each of these compounds affect the function of ATCase?

The concerted and sequential models for the behavior of allosteric enzymes differ in

Cofactors are

Which of the following does not apply to the concerted model for subunit behavior:

Which of the following is not a difference between the concerted model and the sequential model of allosteric enzymes?

Phosphorylation and allosteric control of enzymes.

Biochemistry and the Organization of Cells

Water the Solvent for Biochemical Reactions

Amino Acids and Peptides

The Three Dimensional Structure of Proteins

Protein Purification and Characterization Techniques

The Behavior of Proteins Enzymes

Lipids and Proteins Are Associated in Biological Membranes

Nucleic Acids How Structure Conveys Information

Biosynthesis of Nucleic Acids Replication

Transcription of the Genetic Code the Biosynthesis of Rna

Protein Synthesis Translation of the Genetic Message

Nucleic Acid Biotechnology Techniques

Viruses Cancer and Immunology

The Importance of Energy Changes and Electron Transfer in Metabolism

Carbohydrates

Glycolysis

Storage Mechanisms and Control in Carbohydrate Metabolism

The Citric Acid Cycle

Electron Transport and Oxidative Phosphorylation

Lipid Metabolism

Photosynthesis

The Metabolism of Nitrogen

Integration of Metabolism Cellular Signaling

Filters