Question 1

Which of the following correctly accounts for the regulation of carbamoyl phosphate synthetase I?

Accepted Answer

A) inhibited by N-acetylglutamate, activated by acetylation of a lysine residue 
B) inhibited by N-acetylglutamate, activated by phosphorylation of a tyrosine residue 
C) activated by N-acetylglutamate, inhibited by acetylation of a lysine residue 
D) activated by N-acetylglutamate, activated by phosphorylation of a tyrosine residue 
E) none of the above 
A) inhibited by N-acetylglutamate, activated by acetylation of a lysine residue 
B) inhibited by N-acetylglutamate, activated by phosphorylation of a tyrosine residue 
C) activated by N-acetylglutamate, inhibited by acetylation of a lysine residue 
D) activated by N-acetylglutamate, activated by phosphorylation of a tyrosine residue 
E) none of the above

Question 2

Which of the following amino acids relies upon the synthesis of carbamoyl phosphate?

Accepted Answer

A) lysine 
B) histidine 
C) arginine 
D) glutamine 
E) asparagine 
A) lysine 
B) histidine 
C) arginine 
D) glutamine 
E) asparagine

Question 3

What is the only reaction of mammalian amino acid metabolism that is dependent upon vitamin B12?

Accepted Answer

A) conversion of phenylalanine to tyrosine 
B) conversion of homocysteine to methionine 
C) isomerization of methylmalonyl-CoA to succinyl-CoA 
D) methane synthesis 
E) none of the above 
A) conversion of phenylalanine to tyrosine 
B) conversion of homocysteine to methionine 
C) isomerization of methylmalonyl-CoA to succinyl-CoA 
D) methane synthesis 
E) none of the above

Question 4

Which of the following correctly explains the covalent modification used to control glutamine synthetase?

Accepted Answer

A) uridylylation activates, deuridylylation inhibits 
B) uridylylation inhibits, deuridylylation activates 
C) adenylation activates, deadenylation inhibits 
D) adenylation inhibits, deadenylation activates 
E) phosphorylation inhibits, dephosphorylation activates 
A) uridylylation activates, deuridylylation inhibits 
B) uridylylation inhibits, deuridylylation activates 
C) adenylation activates, deadenylation inhibits 
D) adenylation inhibits, deadenylation activates 
E) phosphorylation inhibits, dephosphorylation activates

Question 5

The reaction catalyzed by nitrite reductase requires _______ electrons and is summarized as _____________.

Accepted Answer

A) 2; NO3- $\rarr$NO2- 
B) 2; NO2- $\rarr$NO- 
C) 4; NO2- $\rarr$ NO- $\rarr$NH2OH 
D) 4; NO2- $\rarr$ NO- $\rarr$ NH3 
E) 6; NO2- $\rarr$ NO- $\rarr$NH2OH $\rarr$ NH3 
A) 2; NO3- $\rarr$NO2- 
B) 2; NO2- $\rarr$NO- 
C) 4; NO2- $\rarr$ NO- $\rarr$NH2OH 
D) 4; NO2- $\rarr$ NO- $\rarr$ NH3 
E) 6; NO2- $\rarr$ NO- $\rarr$NH2OH $\rarr$ NH3

Which of the following correctly accounts for the regulation of carbamoyl phosphate synthetase I?

Which of the following amino acids relies upon the synthesis of carbamoyl phosphate?

What is the only reaction of mammalian amino acid metabolism that is dependent upon vitamin B₁₂?

Which of the following correctly explains the covalent modification used to control glutamine synthetase?

The reaction catalyzed by nitrite reductase requires _ electrons and is summarized as _______.

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

Citric Acid Cycle and Glyoxylate Cycle

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

Which of the following correctly accounts for the regulation of carbamoyl phosphate synthetase I?

Which of the following amino acids relies upon the synthesis of carbamoyl phosphate?

What is the only reaction of mammalian amino acid metabolism that is dependent upon vitamin B12?

Which of the following correctly explains the covalent modification used to control glutamine synthetase?

The reaction catalyzed by nitrite reductase requires _______ electrons and is summarized as _____________.

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

Citric Acid Cycle and Glyoxylate Cycle

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 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

What is the only reaction of mammalian amino acid metabolism that is dependent upon vitamin B₁₂?

The reaction catalyzed by nitrite reductase requires _ electrons and is summarized as _______.