Question 1

Glutamate is metabolically converted to $\alpha$-ketoglutarate and NH4+ by a process described as:

Accepted Answer

A) deamination. 
B) hydrolysis. 
C) oxidative deamination. 
D) reductive deamination. 
E) transamination. 
A) deamination. 
B) hydrolysis. 
C) oxidative deamination. 
D) reductive deamination. 
E) transamination.

Question 2

The bacterium responsible for gastric ulcers,Helicobacter pylori,survives the acidic pH of the stomach surprisingly well.It does so in part by synthesizing and excreting large amounts of the enzyme urease,which hydrolyzes urea to bicarbonate and ammonia.Explain how these reaction products lead to a less acidic environment for H.pylori.

Accepted Answer

Bicarbonate is a good buffer.Additionall

Question 3

Which of the following is a zymogen that can be converted to an endopeptidase that hydrolyzes peptide bonds adjacent to Lys and Arg residues?

Accepted Answer

A) Chymotrypsinogen 
B) Pepsin 
C) Pepsinogen 
D) Trypsin 
E) Trypsinogen 
A) Chymotrypsinogen 
B) Pepsin 
C) Pepsinogen 
D) Trypsin 
E) Trypsinogen

Question 4

Draw the structures of reactants and products in the transamination in which glutamate and pyruvate are the starting materials.What cofactor is required for this reaction?

Accepted Answer

The correct answer is the reve

Question 5

Conversion of ornithine to citrulline is a step in the synthesis of:

Accepted Answer

A) aspartate. 
B) carnitine. 
C) pyruvate. 
D) tyrosine. 
E) urea. 
A) aspartate. 
B) carnitine. 
C) pyruvate. 
D) tyrosine. 
E) urea.

Question 6

If a person's urine contains unusually high concentrations of urea,which one of the following diets has he or she probably been eating recently?

Accepted Answer

A) High carbohydrate,very low protein 
B) Very high carbohydrate,no protein,no fat 
C) Very very high fat,high carbohydrate,no protein 
D) Very high fat,very low protein 
E) Very low carbohydrate,very high protein 
A) High carbohydrate,very low protein 
B) Very high carbohydrate,no protein,no fat 
C) Very very high fat,high carbohydrate,no protein 
D) Very high fat,very low protein 
E) Very low carbohydrate,very high protein

Question 7

In amino acid catabolism,the first reaction for many amino acids is a(n):

Accepted Answer

A) decarboxylation requiring thiamine pyrophosphate (TPP). 
B) hydroxylation requiring NADPH and O2. 
C) oxidative deamination requiring NAD+. 
D) reduction requiring pyridoxal phosphate (PLP). 
E) transamination requiring pyridoxal phosphate (PLP). 
A) decarboxylation requiring thiamine pyrophosphate (TPP). 
B) hydroxylation requiring NADPH and O2. 
C) oxidative deamination requiring NAD+. 
D) reduction requiring pyridoxal phosphate (PLP). 
E) transamination requiring pyridoxal phosphate (PLP).

Question 8

Tetrahydrofolate (THF)and its derivatives shuttle between different substrates.

Accepted Answer

A) electrons 
B) H+ 
C) acyl groups 
D) one carbon units 
E) NH2 groups 
A) electrons 
B) H+ 
C) acyl groups 
D) one carbon units 
E) NH2 groups

Glutamate is metabolically converted to $\alpha$ -ketoglutarate and NH₄⁺ by a process described as:

Which of the following is a zymogen that can be converted to an endopeptidase that hydrolyzes peptide bonds adjacent to Lys and Arg residues?

Draw the structures of reactants and products in the transamination in which glutamate and pyruvate are the starting materials.What cofactor is required for this reaction?

Conversion of ornithine to citrulline is a step in the synthesis of:

If a person's urine contains unusually high concentrations of urea,which one of the following diets has he or she probably been eating recently?

In amino acid catabolism,the first reaction for many amino acids is a(n):

Tetrahydrofolate (THF)and its derivatives shuttle between different substrates.

The Foundations of Biochemistry

Water

Amino Acids, peptides, and Proteins

The Three-Dimensional Structure of Proteins

Protein Function

Enzymes

Carbohydrates and Glycobiology

Nucleotides and Nucleic Acids

Recombinant Dna Technology

Lipids

Biological Membranes and Transport

Biosignaling

Principles of Bioenergetics

Glycolysis, gluconeogenesis, and the Pentose Phosphate Pathway

Principles of Metabolic Regulation

The Citric Acid Cycle

Fatty Acid Catabolism

Oxidative Phosphorylation and Photophosphorylation

Carbohydrate Biosynthesis in Plants and Bacteria

Lipid Biosynthesis

Biosynthesis of Amino Acids, nucleotides, and Related Molecules

Integration and Hormonal Regulation of Mammalian Metabolism

Genes and Chromosomes

Dna Metabolism

Rna Metabolism

Protein Metabolism

Regulation of Gene Expression

Filters

Exam 18: Amino Acid Oxidation and the Production of Urea

Glutamate is metabolically converted to α\alphaα -ketoglutarate and NH4+ by a process described as:

Which of the following is a zymogen that can be converted to an endopeptidase that hydrolyzes peptide bonds adjacent to Lys and Arg residues?

Draw the structures of reactants and products in the transamination in which glutamate and pyruvate are the starting materials.What cofactor is required for this reaction?

Conversion of ornithine to citrulline is a step in the synthesis of:

If a person's urine contains unusually high concentrations of urea,which one of the following diets has he or she probably been eating recently?

In amino acid catabolism,the first reaction for many amino acids is a(n):

Tetrahydrofolate (THF)and its derivatives shuttle between different substrates.

The Foundations of Biochemistry

Water

Amino Acids, peptides, and Proteins

The Three-Dimensional Structure of Proteins

Protein Function

Enzymes

Carbohydrates and Glycobiology

Nucleotides and Nucleic Acids

Recombinant Dna Technology

Lipids

Biological Membranes and Transport

Biosignaling

Principles of Bioenergetics

Glycolysis, gluconeogenesis, and the Pentose Phosphate Pathway

Principles of Metabolic Regulation

The Citric Acid Cycle

Fatty Acid Catabolism

Oxidative Phosphorylation and Photophosphorylation

Carbohydrate Biosynthesis in Plants and Bacteria

Lipid Biosynthesis

Biosynthesis of Amino Acids, nucleotides, and Related Molecules

Integration and Hormonal Regulation of Mammalian Metabolism

Genes and Chromosomes

Dna Metabolism

Rna Metabolism

Protein Metabolism

Regulation of Gene Expression

Filters

Glutamate is metabolically converted to $\alpha$ -ketoglutarate and NH₄⁺ by a process described as: