Question 1

The carbon chains of amino acids enter the major metabolic pathways through all of these compounds,except:

Accepted Answer

A) a-ketoglutarate 
B) Pyruvate 
C) Glyceraldehyde 
D) Acetyl CoA 
E) All of these are entry points for amino acid catabolism. 
A) a-ketoglutarate 
B) Pyruvate 
C) Glyceraldehyde 
D) Acetyl CoA 
E) All of these are entry points for amino acid catabolism.

Question 2

By means of a semialdehyde intermediate,glutamate is involved in the synthesis of which of the following amino acids?

Accepted Answer

A) Arginine 
B) Glutamine 
C) Lysine 
D) Proline 
E) Both a and d. 
A) Arginine 
B) Glutamine 
C) Lysine 
D) Proline 
E) Both a and d.

Question 3

3-Phosphoglycerate contains the carbon skeleton used to make

Accepted Answer

A) serine 
B) cysteine 
C) glycine 
D) all of these 
A) serine 
B) cysteine 
C) glycine 
D) all of these

Question 4

Which of the following is not an intermediate in the urea cycle?

Accepted Answer

A) arginine 
B) citrulline 
C) ornithine 
D) lysine 
A) arginine 
B) citrulline 
C) ornithine 
D) lysine

Question 5

What product would be obtained from enzymatic transamination of 3-hydroxy-2-ketopropanoic acid?

Accepted Answer

The answer of What product would be obtained from enzymatic...

Question 6

A coenzyme frequently encountered in transamination reactions is

Accepted Answer

A) tetrahydrofolate 
B) pyridoxal phosphate 
C) thiamine pyrophosphate 
D) biotin 
A) tetrahydrofolate 
B) pyridoxal phosphate 
C) thiamine pyrophosphate 
D) biotin

Question 7

Transamination of pyruvate with glutamate as the nitrogen donor gives:

Accepted Answer

A) alanine 
B) serine 
C) cysteine 
D) aspartate 
E) tyrosine 
A) alanine 
B) serine 
C) cysteine 
D) aspartate 
E) tyrosine

Question 8

All of the following are metabolic intermediates of a-amino acid carbon skeletons except:

Accepted Answer

A) pyridoxine 
B) a-ketoglutarate 
C) oxaloacetate 
D) succinyl-CoA 
E) fumarate 
A) pyridoxine 
B) a-ketoglutarate 
C) oxaloacetate 
D) succinyl-CoA 
E) fumarate

Question 9

Ornithine serves three metabolically important roles but is not found in proteins.Which of the following statements about ornithine is not true?

Accepted Answer

A) It is a precursor in the synthesis of citrulline. 
B) It is an intermediate in the urea cycle. 
C) It is a precursor in the synthesis of arginine. 
D) It is biosynthesized from glutamine. 
E) It is a product of arginine hydrolysis. 
A) It is a precursor in the synthesis of citrulline. 
B) It is an intermediate in the urea cycle. 
C) It is a precursor in the synthesis of arginine. 
D) It is biosynthesized from glutamine. 
E) It is a product of arginine hydrolysis.

Question 10

Consider the deamination of serine to answer the following questions.
a)  Draw the structure of the a-keto acid produced by the deamination of serine.
b)  What is the fate of the amino group in serine when this conversion occurs in a mammalian system?

Accepted Answer

a) 11ec72b4_8050_2b71_9c44_4bc

Question 11

Aspartate is formed from transamination of:

Accepted Answer

A) asparagine 
B) aspartame 
C) oxaloacetate 
D) citrate 
E) a-ketoglutarate 
A) asparagine 
B) aspartame 
C) oxaloacetate 
D) citrate 
E) a-ketoglutarate

Question 12

The formation of amino acids from proteins

Accepted Answer

A) occurs during anabolism. 
B) is endergonic. 
C) occurs during digestion. 
D) is a cellular process. 
E) all of these 
A) occurs during anabolism. 
B) is endergonic. 
C) occurs during digestion. 
D) is a cellular process. 
E) all of these

Question 13

Suppose that the formation of a dipeptide is endergonic by +14.7 kJ/mol.If this reaction is coupled with the hydrolysis of ATP,will the net reaction be spontaneous or nonspontaneous? Explain your answer.

Accepted Answer

The net reaction will be spontaneous sin

Question 14

The reaction,2 NH4+ + a-ketoglutarate + NADPH + ATP ® glutamine + NADP+ + ADP + Pi + H2O,is the combined result of what two enzymes?

Accepted Answer

A) nitrogenase and glutamate dehydrogenase (GDH) 
B) GDH and glutamine synthetase (GS) 
C) GS and nitrogenase 
D) GDH and nitrogenase 
E) all of these are correct 
A) nitrogenase and glutamate dehydrogenase (GDH) 
B) GDH and glutamine synthetase (GS) 
C) GS and nitrogenase 
D) GDH and nitrogenase 
E) all of these are correct

The carbon chains of amino acids enter the major metabolic pathways through all of these compounds,except:

By means of a semialdehyde intermediate,glutamate is involved in the synthesis of which of the following amino acids?

3-Phosphoglycerate contains the carbon skeleton used to make

Which of the following is not an intermediate in the urea cycle?

What product would be obtained from enzymatic transamination of 3-hydroxy-2-ketopropanoic acid?

A coenzyme frequently encountered in transamination reactions is

Transamination of pyruvate with glutamate as the nitrogen donor gives:

All of the following are metabolic intermediates of a-amino acid carbon skeletons except:

Ornithine serves three metabolically important roles but is not found in proteins.Which of the following statements about ornithine is not true?

Consider the deamination of serine to answer the following questions. a) Draw the structure of the a-keto acid produced by the deamination of serine. b) What is the fate of the amino group in serine when this conversion occurs in a mammalian system?

Aspartate is formed from transamination of:

The formation of amino acids from proteins

Suppose that the formation of a dipeptide is endergonic by +14.7 kJ/mol.If this reaction is coupled with the hydrolysis of ATP,will the net reaction be spontaneous or nonspontaneous? Explain your answer.

The reaction,2 NH₄⁺ + a-ketoglutarate + NADPH + ATP ® glutamine + NADP⁺ + ADP + P_i + H₂O,is the combined result of what two enzymes?

Structure and Bonding

Polar Covalent Bonds: Acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Alkenes and Alkynes

Reactions of Alkenes and Alkynes

Aromatic Compounds

Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols,phenols,and Thiols: Ethers and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution and Condensation Reactions

Amines and Heterocycles

Biomolecules: Amino Acids,peptides,and Proteins

Biomolecules: Carbohydrates

Carbohydrate Metabolism

Biomolecules: Lipids and Their Metabolism

Biomolecules: Nucleic Acids and Their Metabolism

Filters

Exam 20: Amino Acid Metabolism

The carbon chains of amino acids enter the major metabolic pathways through all of these compounds,except:

By means of a semialdehyde intermediate,glutamate is involved in the synthesis of which of the following amino acids?

3-Phosphoglycerate contains the carbon skeleton used to make

Which of the following is not an intermediate in the urea cycle?

What product would be obtained from enzymatic transamination of 3-hydroxy-2-ketopropanoic acid?

A coenzyme frequently encountered in transamination reactions is

Transamination of pyruvate with glutamate as the nitrogen donor gives:

All of the following are metabolic intermediates of a-amino acid carbon skeletons except:

Ornithine serves three metabolically important roles but is not found in proteins.Which of the following statements about ornithine is not true?

Consider the deamination of serine to answer the following questions. a) Draw the structure of the a-keto acid produced by the deamination of serine. b) What is the fate of the amino group in serine when this conversion occurs in a mammalian system?

Aspartate is formed from transamination of:

The formation of amino acids from proteins

Suppose that the formation of a dipeptide is endergonic by +14.7 kJ/mol.If this reaction is coupled with the hydrolysis of ATP,will the net reaction be spontaneous or nonspontaneous? Explain your answer.

The reaction,2 NH4+ + a-ketoglutarate + NADPH + ATP ® glutamine + NADP+ + ADP + Pi + H2O,is the combined result of what two enzymes?

Structure and Bonding

Polar Covalent Bonds: Acids and Bases

Organic Compounds: Alkanes and Their Stereochemistry

Organic Compounds: Cycloalkanes and Their Stereochemistry

Stereochemistry at Tetrahedral Centers

An Overview of Organic Reactions

Alkenes and Alkynes

Reactions of Alkenes and Alkynes

Aromatic Compounds

Structure Determination: Mass Spectrometry,infrared Spectroscopy,and Ultraviolet Spectroscopy

Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Organohalides: Nucleophilic Substitutions and Eliminations

Alcohols,phenols,and Thiols: Ethers and Sulfides

Aldehydes and Ketones: Nucleophilic Addition Reactions

Carboxylic Acids and Nitriles

Carboxylic Acid Derivatives: Nucleophilic Acyl Substitution Reactions

Carbonyl Alpha-Substitution and Condensation Reactions

Amines and Heterocycles

Biomolecules: Amino Acids,peptides,and Proteins

Biomolecules: Carbohydrates

Carbohydrate Metabolism

Biomolecules: Lipids and Their Metabolism

Biomolecules: Nucleic Acids and Their Metabolism

Filters

The reaction,2 NH₄⁺ + a-ketoglutarate + NADPH + ATP ® glutamine + NADP⁺ + ADP + P_i + H₂O,is the combined result of what two enzymes?