Question 1

Which of the following is NOT a characteristic of kcₐt/Km?

Accepted Answer

A) It corresponds to a second-order rate constant. 
B) It provides an excellent parameter for comparison of the catalytic efficiency of enzymes. 
C) It reflects the property of the enzyme when substrate concentration is at saturation. 
D) The upper limit for the kcat/Km value is fixed by the diffusion-controlled limit for reactions,which is 109 M⁻¹ s⁻¹. 
A) It corresponds to a second-order rate constant. 
B) It provides an excellent parameter for comparison of the catalytic efficiency of enzymes. 
C) It reflects the property of the enzyme when substrate concentration is at saturation. 
D) The upper limit for the kcat/Km value is fixed by the diffusion-controlled limit for reactions,which is 109 M⁻¹ s⁻¹.

Question 2

Which of the following is NOT correct for a competitive inhibitor?

Accepted Answer

A) It binds a site other than the active site. 
B) EI does not give rise to E + P. 
C) For a given [I],v decreases. 
D) At some point,S can displace all of I on E. 
A) It binds a site other than the active site. 
B) EI does not give rise to E + P. 
C) For a given [I],v decreases. 
D) At some point,S can displace all of I on E.

Question 3

Which of the following defines the kinetics of a reaction when every enzyme molecule in the reaction mixture has its substrate-binding site occupied by substrate?

Accepted Answer

A) The kinetics become zero order and the velocity is Vmax/2. 
B) The kinetics become zero order and the velocity is Vmax. 
C) The kinetics become first order and the velocity is Vmax/2. 
D) The kinetics become first order and the velocity isVmax. 
A) The kinetics become zero order and the velocity is Vmax/2. 
B) The kinetics become zero order and the velocity is Vmax. 
C) The kinetics become first order and the velocity is Vmax/2. 
D) The kinetics become first order and the velocity isVmax.

Which of the following is NOT a characteristic of k_cₐt/K_m?

Which of the following is NOT correct for a competitive inhibitor?

Which of the following defines the kinetics of a reaction when every enzyme molecule in the reaction mixture has its substrate-binding site occupied by substrate?

The Facts of Life: Chemistry Is the Logic of Biological Phenomena

Water: the Medium of Life

Thermodynamics of Biological Systems

Amino Acids

Proteins: Their Primary Structure and Biological Functions

Proteins: Secondary, tertiary, and Quaternary Structure

Carbohydrates and the Glycoconjugates of Cell Surfaces

Lipids

Lipid Biosynthesis

Membranes and Membrane Transport

The Reception and Transmission of Extracellular Information

Mechanisms of Enzyme Action

Enzyme Regulation

Molecular Motors

Nutrition and the Organization of Metabolism

Glycolysis

The Tricarboxylic Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Fatty Acid Catabolism

Nitrogen Acquisition and Amino Acid Metabolism

Nucleotides and Nucleic Acids

Structure of Nucleic Acids

Synthesis and Degradation of Nucleotides

Recombinant Dna: Cloning and Creation of Chimeric Genes

DNA Metabolism: Replication, recombination, and Repair

Transcription and the Regulation of Gene Expression

Protein Synthesis

Post-Transcriptional Regulation of Gene Expression

Completing the Protein Life Cycle: Folding, processing, and Degradation

Metabolic Integration and Organ Specialization

Filters

Exam 12: Enzymes Kinetics and Specificity

Which of the following is NOT a characteristic of kcₐt/Km?

Which of the following is NOT correct for a competitive inhibitor?

Which of the following defines the kinetics of a reaction when every enzyme molecule in the reaction mixture has its substrate-binding site occupied by substrate?

The Facts of Life: Chemistry Is the Logic of Biological Phenomena

Water: the Medium of Life

Thermodynamics of Biological Systems

Amino Acids

Proteins: Their Primary Structure and Biological Functions

Proteins: Secondary, tertiary, and Quaternary Structure

Carbohydrates and the Glycoconjugates of Cell Surfaces

Lipids

Lipid Biosynthesis

Membranes and Membrane Transport

The Reception and Transmission of Extracellular Information

Mechanisms of Enzyme Action

Enzyme Regulation

Molecular Motors

Nutrition and the Organization of Metabolism

Glycolysis

The Tricarboxylic Acid Cycle

Electron Transport and Oxidative Phosphorylation

Photosynthesis

Gluconeogenesis, glycogen Metabolism, and the Pentose Phosphate Pathway

Fatty Acid Catabolism

Nitrogen Acquisition and Amino Acid Metabolism

Nucleotides and Nucleic Acids

Structure of Nucleic Acids

Synthesis and Degradation of Nucleotides

Recombinant Dna: Cloning and Creation of Chimeric Genes

DNA Metabolism: Replication, recombination, and Repair

Transcription and the Regulation of Gene Expression

Protein Synthesis

Post-Transcriptional Regulation of Gene Expression

Completing the Protein Life Cycle: Folding, processing, and Degradation

Metabolic Integration and Organ Specialization

Filters

Which of the following is NOT a characteristic of k_cₐt/K_m?