Question 1

Which of the following citric acid cycle enzymes is bypassed in the glyoxylate cycle?

Accepted Answer

A) citrate synthase 
B) aconitase 
C) isocitrate dehydrogenase 
D) succinate dehydrogenase 
E) fumarase 
A) citrate synthase 
B) aconitase 
C) isocitrate dehydrogenase 
D) succinate dehydrogenase 
E) fumarase

Question 2

Which of the following correctly lists the products of the pyruvate dehydrogenase complex in the correct order of release?

Accepted Answer

A) acetyl-CoA, CO2, NADH 
B) acetyl-CoA, CO2, FADH2 
C) CO2, acetyl-CoA, NADH 
D) CO2, acetyl-CoA, FADH2 
E) CO2, acetyl-CoA, FADH2, NADH 
A) acetyl-CoA, CO2, NADH 
B) acetyl-CoA, CO2, FADH2 
C) CO2, acetyl-CoA, NADH 
D) CO2, acetyl-CoA, FADH2 
E) CO2, acetyl-CoA, FADH2, NADH

Question 3

Which of the following best explains why thioesters have a greater free energy of hydrolysis than ordinary esters?

Accepted Answer

A) alcohols are better leaving groups than thiols 
B) oxygen is more electronegative than sulfur 
C) esters are resonance stabilized while thioesters are not 
D) the oxygen of an ester is more easily protonated than the sulfur of a thioester 
E) none of the above 
A) alcohols are better leaving groups than thiols 
B) oxygen is more electronegative than sulfur 
C) esters are resonance stabilized while thioesters are not 
D) the oxygen of an ester is more easily protonated than the sulfur of a thioester 
E) none of the above

Question 4

What is the source of acetyl-CoA for the glyoxylate cycle?

Accepted Answer

A) pyruvate 
B) amino acids 
C) fatty acids 
D) cholesterol 
E) all of the above 
A) pyruvate 
B) amino acids 
C) fatty acids 
D) cholesterol 
E) all of the above

Question 5

The glyoxylate cycle reaction catalyzed by isocitrate lyase is a reversible aldol condensation. As it is written below, the reaction is an aldol cleavage. Propose a mechanism for this reaction using the acid and base supplied by the enzyme.

Accepted Answer

The answer of The glyoxylate cycle reaction catalyzed by isocitrate...

Which of the following citric acid cycle enzymes is bypassed in the glyoxylate cycle?

Which of the following correctly lists the products of the pyruvate dehydrogenase complex in the correct order of release?

Which of the following best explains why thioesters have a greater free energy of hydrolysis than ordinary esters?

What is the source of acetyl-CoA for the glyoxylate cycle?

The glyoxylate cycle reaction catalyzed by isocitrate lyase is a reversible aldol condensation. As it is written below, the reaction is an aldol cleavage. Propose a mechanism for this reaction using the acid and base supplied by the enzyme.

The Scope of Biochemistry

The Matrix of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

The Three-Dimensional Structure of Proteins

Protein Function and Evolution

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars, Saccharides, Glycans

Lipids, Membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

Carbohydrate Metabolism: Glycolysis, Gluconeogenesis, Glycogen Metabolism, and the Pentose Phosphate Pathway

Electron Transport, Oxidative Phosphorylation, and Oxygen Metabolism

Photosynthesis

Lipid Metabolism I: Fatty Acids, Triacylglycerols, and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, Steroids, Isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, Utilization, and Turnover

Metabolism of Nitogenous Compounds II: Amino Acids, Porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes, Genomes and Chromosomes

DNA Replication

DNA Restructuring: Repair, Recombination, Rearrangement, Amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

Filters

Exam 14: Citric Acid Cycle and Glyoxylate Cycle

Which of the following citric acid cycle enzymes is bypassed in the glyoxylate cycle?

Which of the following correctly lists the products of the pyruvate dehydrogenase complex in the correct order of release?

Which of the following best explains why thioesters have a greater free energy of hydrolysis than ordinary esters?

What is the source of acetyl-CoA for the glyoxylate cycle?

The glyoxylate cycle reaction catalyzed by isocitrate lyase is a reversible aldol condensation. As it is written below, the reaction is an aldol cleavage. Propose a mechanism for this reaction using the acid and base supplied by the enzyme.

The Scope of Biochemistry

The Matrix of Life: Weak Interactions in an Aqueous Environment

The Energetics of Life

Nucleic Acids

Introduction to Proteins: the Primary Level of Protein Structure

The Three-Dimensional Structure of Proteins

Protein Function and Evolution

Contractile Proteins and Molecular Motors

Carbohydrates: Sugars, Saccharides, Glycans

Lipids, Membranes and Cellular Transport

Enzymes: Biological Catalysts

Chemical Logic of Metabolism

Carbohydrate Metabolism: Glycolysis, Gluconeogenesis, Glycogen Metabolism, and the Pentose Phosphate Pathway

Electron Transport, Oxidative Phosphorylation, and Oxygen Metabolism

Photosynthesis

Lipid Metabolism I: Fatty Acids, Triacylglycerols, and Lipoproteins

Interorgan and Intracellular Coordination of Energy Metabolism in Vertebrates

Lipid Metabolism Ii: Membrane Lipids, Steroids, Isoprenoids, and Eicosanoids

Metabolism of Nitrogenous Compounds I: Principles of Biosynthesis, Utilization, and Turnover

Metabolism of Nitogenous Compounds II: Amino Acids, Porphyrins, and Neurotransmitters

Nucleotide Metabolism

Mechanisms of Signal Transduction

Genes, Genomes and Chromosomes

DNA Replication

DNA Restructuring: Repair, Recombination, Rearrangement, Amplification

Information Readout: Transcription and Post-Transcriptional Processing

Information Decoding: Translation and Post-Translational Protein Processing

Regulation of Gene Expression

Filters